/*!
 * FullCalendar v1.6.7
 * Docs & License: http://arshaw.com/fullcalendar/
 * (c) 2013 Adam Shaw
 */

/*
 * Use fullcalendar.css for basic styling.
 * For event drag & drop, requires jQuery UI draggable.
 * For event resizing, requires jQuery UI resizable.
 */
 
(function($, undefined) {




var defaults = {

    // display
    defaultView: 'month',
    aspectRatio: 1.35,
    header: {
        left: 'title',
        center: '',
        right: 'today prev,next'
    },
    weekends: true,
    weekNumbers: false,
    weekNumberCalculation: 'iso',
    weekNumberTitle: 'W',
    
    // editing
    //editable: false,
    //disableDragging: false,
    //disableResizing: false,
    
    allDayDefault: true,
    ignoreTimezone: true,
    
    // event ajax
    lazyFetching: true,
    startParam: 'start',
    endParam: 'end',
    
    // time formats
    titleFormat: {
        month: 'MMMM yyyy',
        week: "MMM d[ yyyy]{ '&#8212;'[ MMM] d yyyy}",
        day: 'dddd, MMM d, yyyy'
    },
    columnFormat: {
        month: 'ddd',
        week: 'ddd M/d',
        day: 'dddd M/d'
    },
    timeFormat: { // for event elements
        '': 'h(:mm)t' // default
    },
    
    // locale
    isRTL: false,
    firstDay: 0,
    monthNames: ['January','February','March','April','May','June','July','August','September','October','November','December'],
    monthNamesShort: ['Jan','Feb','Mar','Apr','May','Jun','Jul','Aug','Sep','Oct','Nov','Dec'],
    dayNames: ['Sunday','Monday','Tuesday','Wednesday','Thursday','Friday','Saturday'],
    dayNamesShort: ['Sun','Mon','Tue','Wed','Thu','Fri','Sat'],
    buttonText: {
        prev: "<span class='fc-text-arrow'>&lsaquo;</span>",
        next: "<span class='fc-text-arrow'>&rsaquo;</span>",
        prevYear: "<span class='fc-text-arrow'>&laquo;</span>",
        nextYear: "<span class='fc-text-arrow'>&raquo;</span>",
        today: 'today',
        month: 'month',
        week: 'week',
        day: 'day'
    },
    
    // jquery-ui theming
    theme: false,
    buttonIcons: {
        prev: 'circle-triangle-w',
        next: 'circle-triangle-e'
    },
    
    //selectable: false,
    unselectAuto: true,
    
    dropAccept: '*',
    
    handleWindowResize: true
    
};

// right-to-left defaults
var rtlDefaults = {
    header: {
        left: 'next,prev today',
        center: '',
        right: 'title'
    },
    buttonText: {
        prev: "<span class='fc-text-arrow'>&rsaquo;</span>",
        next: "<span class='fc-text-arrow'>&lsaquo;</span>",
        prevYear: "<span class='fc-text-arrow'>&raquo;</span>",
        nextYear: "<span class='fc-text-arrow'>&laquo;</span>"
    },
    buttonIcons: {
        prev: 'circle-triangle-e',
        next: 'circle-triangle-w'
    }
};





var fc = $.fullCalendar = { version: "1.6.7" };
var fcViews = fc.views = {};


$.fn.fullCalendar = function(options) {


    // method calling
    if (typeof options == 'string') {
        var args = Array.prototype.slice.call(arguments, 1);
        var res;
        this.each(function() {
            var calendar = $.data(this, 'fullCalendar');
            if (calendar && $.isFunction(calendar[options])) {
                var r = calendar[options].apply(calendar, args);
                if (res === undefined) {
                    res = r;
                }
                if (options == 'destroy') {
                    $.removeData(this, 'fullCalendar');
                }
            }
        });
        if (res !== undefined) {
            return res;
        }
        return this;
    }

    options = options || {};
    
    // would like to have this logic in EventManager, but needs to happen before options are recursively extended
    var eventSources = options.eventSources || [];
    delete options.eventSources;
    if (options.events) {
        eventSources.push(options.events);
        delete options.events;
    }
    

    options = $.extend(true, {},
        defaults,
        (options.isRTL || options.isRTL===undefined && defaults.isRTL) ? rtlDefaults : {},
        options
    );
    
    
    this.each(function(i, _element) {
        var element = $(_element);
        var calendar = new Calendar(element, options, eventSources);
        element.data('fullCalendar', calendar); // TODO: look into memory leak implications
        calendar.render();
    });
    
    
    return this;
    
};


// function for adding/overriding defaults
function setDefaults(d) {
    $.extend(true, defaults, d);
}





 
function Calendar(element, options, eventSources) {
    var t = this;
    
    
    // exports
    t.options = options;
    t.render = render;
    t.destroy = destroy;
    t.refetchEvents = refetchEvents;
    t.reportEvents = reportEvents;
    t.reportEventChange = reportEventChange;
    t.rerenderEvents = rerenderEvents;
    t.changeView = changeView;
    t.select = select;
    t.unselect = unselect;
    t.prev = prev;
    t.next = next;
    t.prevYear = prevYear;
    t.nextYear = nextYear;
    t.today = today;
    t.gotoDate = gotoDate;
    t.incrementDate = incrementDate;
    t.formatDate = function(format, date) { return formatDate(format, date, options); };
    t.formatDates = function(format, date1, date2) { return formatDates(format, date1, date2, options); };
    t.getDate = getDate;
    t.getView = getView;
    t.option = option;
    t.trigger = trigger;
    
    
    // imports
    EventManager.call(t, options, eventSources);
    var isFetchNeeded = t.isFetchNeeded;
    var fetchEvents = t.fetchEvents;
    
    
    // locals
    var _element = element[0];
    var header;
    var headerElement;
    var content;
    var tm; // for making theme classes
    var currentView;
    var elementOuterWidth;
    var suggestedViewHeight;
    var resizeUID = 0;
    var ignoreWindowResize = 0;
    var date = new Date();
    var events = [];
    var _dragElement;
    
    
    
    /* Main Rendering
    -----------------------------------------------------------------------------*/
    
    
    setYMD(date, options.year, options.month, options.date);
    
    
    function render(inc) {
        if (!content) {
            initialRender();
        }
        else if (elementVisible()) {
            // mainly for the public API
            calcSize();
            _renderView(inc);
        }
    }
    
    
    function initialRender() {
        tm = options.theme ? 'ui' : 'fc';
        element.addClass('fc');
        if (options.isRTL) {
            element.addClass('fc-rtl');
        }
        else {
            element.addClass('fc-ltr');
        }
        if (options.theme) {
            element.addClass('ui-widget');
        }

        content = $("<div class='fc-content' style='position:relative'/>")
            .prependTo(element);

        header = new Header(t, options);
        headerElement = header.render();
        if (headerElement) {
            element.prepend(headerElement);
        }

        changeView(options.defaultView);

        if (options.handleWindowResize) {
            $(window).resize(windowResize);
        }

        // needed for IE in a 0x0 iframe, b/c when it is resized, never triggers a windowResize
        if (!bodyVisible()) {
            lateRender();
        }
    }
    
    
    // called when we know the calendar couldn't be rendered when it was initialized,
    // but we think it's ready now
    function lateRender() {
        setTimeout(function() { // IE7 needs this so dimensions are calculated correctly
            if (!currentView.start && bodyVisible()) { // !currentView.start makes sure this never happens more than once
                renderView();
            }
        },0);
    }
    
    
    function destroy() {

        if (currentView) {
            trigger('viewDestroy', currentView, currentView, currentView.element);
            currentView.triggerEventDestroy();
        }

        $(window).unbind('resize', windowResize);

        header.destroy();
        content.remove();
        element.removeClass('fc fc-rtl ui-widget');
    }
    
    
    function elementVisible() {
        return element.is(':visible');
    }
    
    
    function bodyVisible() {
        return $('body').is(':visible');
    }
    
    
    
    /* View Rendering
    -----------------------------------------------------------------------------*/
    

    function changeView(newViewName) {
        if (!currentView || newViewName != currentView.name) {
            _changeView(newViewName);
        }
    }


    function _changeView(newViewName) {
        ignoreWindowResize++;

        if (currentView) {
            trigger('viewDestroy', currentView, currentView, currentView.element);
            unselect();
            currentView.triggerEventDestroy(); // trigger 'eventDestroy' for each event
            freezeContentHeight();
            currentView.element.remove();
            header.deactivateButton(currentView.name);
        }

        header.activateButton(newViewName);

        currentView = new fcViews[newViewName](
            $("<div class='fc-view fc-view-" + newViewName + "' style='position:relative'/>")
                .appendTo(content),
            t // the calendar object
        );

        renderView();
        unfreezeContentHeight();

        ignoreWindowResize--;
    }


    function renderView(inc) {
        if (
            !currentView.start || // never rendered before
            inc || date < currentView.start || date >= currentView.end // or new date range
        ) {
            if (elementVisible()) {
                _renderView(inc);
            }
        }
    }


    function _renderView(inc) { // assumes elementVisible
        ignoreWindowResize++;

        if (currentView.start) { // already been rendered?
            trigger('viewDestroy', currentView, currentView, currentView.element);
            unselect();
            clearEvents();
        }

        freezeContentHeight();
        currentView.render(date, inc || 0); // the view's render method ONLY renders the skeleton, nothing else
        setSize();
        unfreezeContentHeight();
        (currentView.afterRender || noop)();

        updateTitle();
        updateTodayButton();

        trigger('viewRender', currentView, currentView, currentView.element);
        currentView.trigger('viewDisplay', _element); // deprecated

        ignoreWindowResize--;

        getAndRenderEvents();
    }
    
    

    /* Resizing
    -----------------------------------------------------------------------------*/
    
    
    function updateSize() {
        if (elementVisible()) {
            unselect();
            clearEvents();
            calcSize();
            setSize();
            renderEvents();
        }
    }
    
    
    function calcSize() { // assumes elementVisible
        if (options.contentHeight) {
            suggestedViewHeight = options.contentHeight;
        }
        else if (options.height) {
            suggestedViewHeight = options.height - (headerElement ? headerElement.height() : 0) - vsides(content);
        }
        else {
            suggestedViewHeight = Math.round(content.width() / Math.max(options.aspectRatio, .5));
        }
    }
    
    
    function setSize() { // assumes elementVisible

        if (suggestedViewHeight === undefined) {
            calcSize(); // for first time
                // NOTE: we don't want to recalculate on every renderView because
                // it could result in oscillating heights due to scrollbars.
        }

        ignoreWindowResize++;
        currentView.setHeight(suggestedViewHeight);
        currentView.setWidth(content.width());
        ignoreWindowResize--;

        elementOuterWidth = element.outerWidth();
    }
    
    
    function windowResize() {
        if (!ignoreWindowResize) {
            if (currentView.start) { // view has already been rendered
                var uid = ++resizeUID;
                setTimeout(function() { // add a delay
                    if (uid == resizeUID && !ignoreWindowResize && elementVisible()) {
                        if (elementOuterWidth != (elementOuterWidth = element.outerWidth())) {
                            ignoreWindowResize++; // in case the windowResize callback changes the height
                            updateSize();
                            currentView.trigger('windowResize', _element);
                            ignoreWindowResize--;
                        }
                    }
                }, 200);
            }else{
                // calendar must have been initialized in a 0x0 iframe that has just been resized
                lateRender();
            }
        }
    }
    
    
    
    /* Event Fetching/Rendering
    -----------------------------------------------------------------------------*/
    // TODO: going forward, most of this stuff should be directly handled by the view


    function refetchEvents() { // can be called as an API method
        clearEvents();
        fetchAndRenderEvents();
    }


    function rerenderEvents(modifiedEventID) { // can be called as an API method
        clearEvents();
        renderEvents(modifiedEventID);
    }


    function renderEvents(modifiedEventID) { // TODO: remove modifiedEventID hack
        if (elementVisible()) {
            currentView.setEventData(events); // for View.js, TODO: unify with renderEvents
            currentView.renderEvents(events, modifiedEventID); // actually render the DOM elements
            currentView.trigger('eventAfterAllRender');
        }
    }


    function clearEvents() {
        currentView.triggerEventDestroy(); // trigger 'eventDestroy' for each event
        currentView.clearEvents(); // actually remove the DOM elements
        currentView.clearEventData(); // for View.js, TODO: unify with clearEvents
    }
    

    function getAndRenderEvents() {
        if (!options.lazyFetching || isFetchNeeded(currentView.visStart, currentView.visEnd)) {
            fetchAndRenderEvents();
        }
        else {
            renderEvents();
        }
    }


    function fetchAndRenderEvents() {
        fetchEvents(currentView.visStart, currentView.visEnd);
            // ... will call reportEvents
            // ... which will call renderEvents
    }

    
    // called when event data arrives
    function reportEvents(_events) {
        events = _events;
        renderEvents();
    }


    // called when a single event's data has been changed
    function reportEventChange(eventID) {
        rerenderEvents(eventID);
    }



    /* Header Updating
    -----------------------------------------------------------------------------*/


    function updateTitle() {
        header.updateTitle(currentView.title);
    }


    function updateTodayButton() {
        var today = new Date();
        if (today >= currentView.start && today < currentView.end) {
            header.disableButton('today');
        }
        else {
            header.enableButton('today');
        }
    }
    


    /* Selection
    -----------------------------------------------------------------------------*/
    

    function select(start, end, allDay) {
        currentView.select(start, end, allDay===undefined ? true : allDay);
    }
    

    function unselect() { // safe to be called before renderView
        if (currentView) {
            currentView.unselect();
        }
    }
    
    
    
    /* Date
    -----------------------------------------------------------------------------*/
    
    
    function prev() {
        renderView(-1);
    }
    
    
    function next() {
        renderView(1);
    }
    
    
    function prevYear() {
        addYears(date, -1);
        renderView();
    }
    
    
    function nextYear() {
        addYears(date, 1);
        renderView();
    }
    
    
    function today() {
        date = new Date();
        renderView();
    }
    
    
    function gotoDate(year, month, dateOfMonth) {
        if (year instanceof Date) {
            date = cloneDate(year); // provided 1 argument, a Date
        }else{
            setYMD(date, year, month, dateOfMonth);
        }
        renderView();
    }
    
    
    function incrementDate(years, months, days) {
        if (years !== undefined) {
            addYears(date, years);
        }
        if (months !== undefined) {
            addMonths(date, months);
        }
        if (days !== undefined) {
            addDays(date, days);
        }
        renderView();
    }
    
    
    function getDate() {
        return cloneDate(date);
    }



    /* Height "Freezing"
    -----------------------------------------------------------------------------*/


    function freezeContentHeight() {
        content.css({
            width: '100%',
            height: content.height(),
            overflow: 'hidden'
        });
    }


    function unfreezeContentHeight() {
        content.css({
            width: '',
            height: '',
            overflow: ''
        });
    }
    
    
    
    /* Misc
    -----------------------------------------------------------------------------*/
    
    
    function getView() {
        return currentView;
    }
    
    
    function option(name, value) {
        if (value === undefined) {
            return options[name];
        }
        if (name == 'height' || name == 'contentHeight' || name == 'aspectRatio') {
            options[name] = value;
            updateSize();
        }
    }
    
    
    function trigger(name, thisObj) {
        if (options[name]) {
            return options[name].apply(
                thisObj || _element,
                Array.prototype.slice.call(arguments, 2)
            );
        }
    }
    
    
    
    /* External Dragging
    ------------------------------------------------------------------------*/
    
    if (options.droppable) {
        $(document)
            .bind('dragstart', function(ev, ui) {
                var _e = ev.target;
                var e = $(_e);
                if (!e.parents('.fc').length) { // not already inside a calendar
                    var accept = options.dropAccept;
                    if ($.isFunction(accept) ? accept.call(_e, e) : e.is(accept)) {
                        _dragElement = _e;
                        currentView.dragStart(_dragElement, ev, ui);
                    }
                }
            })
            .bind('dragstop', function(ev, ui) {
                if (_dragElement) {
                    currentView.dragStop(_dragElement, ev, ui);
                    _dragElement = null;
                }
            });
    }
    

}



function Header(calendar, options) {
    var t = this;
    
    
    // exports
    t.render = render;
    t.destroy = destroy;
    t.updateTitle = updateTitle;
    t.activateButton = activateButton;
    t.deactivateButton = deactivateButton;
    t.disableButton = disableButton;
    t.enableButton = enableButton;
    
    
    // locals
    var element = $([]);
    var tm;
    


    function render() {
        tm = options.theme ? 'ui' : 'fc';
        var sections = options.header;
        if (sections) {
            element = $("<table class='fc-header' style='width:100%'/>")
                .append(
                    $("<tr/>")
                        .append(renderSection('left'))
                        .append(renderSection('center'))
                        .append(renderSection('right'))
                );
            return element;
        }
    }
    
    
    function destroy() {
        element.remove();
    }
    
    
    function renderSection(position) {
        var e = $("<td class='fc-header-" + position + "'/>");
        var buttonStr = options.header[position];
        if (buttonStr) {
            $.each(buttonStr.split(' '), function(i) {
                if (i > 0) {
                    e.append("<span class='fc-header-space'/>");
                }
                var prevButton;
                $.each(this.split(','), function(j, buttonName) {
                    if (buttonName == 'title') {
                        e.append("<span class='fc-header-title'><h2>&nbsp;</h2></span>");
                        if (prevButton) {
                            prevButton.addClass(tm + '-corner-right');
                        }
                        prevButton = null;
                    }else{
                        var buttonClick;
                        if (calendar[buttonName]) {
                            buttonClick = calendar[buttonName]; // calendar method
                        }
                        else if (fcViews[buttonName]) {
                            buttonClick = function() {
                                button.removeClass(tm + '-state-hover'); // forget why
                                calendar.changeView(buttonName);
                            };
                        }
                        if (buttonClick) {
                            var icon = options.theme ? smartProperty(options.buttonIcons, buttonName) : null; // why are we using smartProperty here?
                            var text = smartProperty(options.buttonText, buttonName); // why are we using smartProperty here?
                            var button = $(
                                "<span class='fc-button fc-button-" + buttonName + " " + tm + "-state-default'>" +
                                    (icon ?
                                        "<span class='fc-icon-wrap'>" +
                                            "<span class='ui-icon ui-icon-" + icon + "'/>" +
                                        "</span>" :
                                        text
                                        ) +
                                "</span>"
                                )
                                .click(function() {
                                    if (!button.hasClass(tm + '-state-disabled')) {
                                        buttonClick();
                                    }
                                })
                                .mousedown(function() {
                                    button
                                        .not('.' + tm + '-state-active')
                                        .not('.' + tm + '-state-disabled')
                                        .addClass(tm + '-state-down');
                                })
                                .mouseup(function() {
                                    button.removeClass(tm + '-state-down');
                                })
                                .hover(
                                    function() {
                                        button
                                            .not('.' + tm + '-state-active')
                                            .not('.' + tm + '-state-disabled')
                                            .addClass(tm + '-state-hover');
                                    },
                                    function() {
                                        button
                                            .removeClass(tm + '-state-hover')
                                            .removeClass(tm + '-state-down');
                                    }
                                )
                                .appendTo(e);
                            disableTextSelection(button);
                            if (!prevButton) {
                                button.addClass(tm + '-corner-left');
                            }
                            prevButton = button;
                        }
                    }
                });
                if (prevButton) {
                    prevButton.addClass(tm + '-corner-right');
                }
            });
        }
        return e;
    }
    
    
    function updateTitle(html) {
        element.find('h2')
            .html(html);
    }
    
    
    function activateButton(buttonName) {
        element.find('span.fc-button-' + buttonName)
            .addClass(tm + '-state-active');
    }
    
    
    function deactivateButton(buttonName) {
        element.find('span.fc-button-' + buttonName)
            .removeClass(tm + '-state-active');
    }
    
    
    function disableButton(buttonName) {
        element.find('span.fc-button-' + buttonName)
            .addClass(tm + '-state-disabled');
    }
    
    
    function enableButton(buttonName) {
        element.find('span.fc-button-' + buttonName)
            .removeClass(tm + '-state-disabled');
    }


}



fc.sourceNormalizers = [];
fc.sourceFetchers = [];

var ajaxDefaults = {
    dataType: 'json',
    cache: false
};

var eventGUID = 1;


function EventManager(options, _sources) {
    var t = this;
    
    
    // exports
    t.isFetchNeeded = isFetchNeeded;
    t.fetchEvents = fetchEvents;
    t.addEventSource = addEventSource;
    t.removeEventSource = removeEventSource;
    t.updateEvent = updateEvent;
    t.renderEvent = renderEvent;
    t.removeEvents = removeEvents;
    t.clientEvents = clientEvents;
    t.normalizeEvent = normalizeEvent;
    
    
    // imports
    var trigger = t.trigger;
    var getView = t.getView;
    var reportEvents = t.reportEvents;
    
    
    // locals
    var stickySource = { events: [] };
    var sources = [ stickySource ];
    var rangeStart, rangeEnd;
    var currentFetchID = 0;
    var pendingSourceCnt = 0;
    var loadingLevel = 0;
    var cache = [];
    
    
    for (var i=0; i<_sources.length; i++) {
        _addEventSource(_sources[i]);
    }
    
    
    
    /* Fetching
    -----------------------------------------------------------------------------*/
    
    
    function isFetchNeeded(start, end) {
        return !rangeStart || start < rangeStart || end > rangeEnd;
    }
    
    
    function fetchEvents(start, end) {
        rangeStart = start;
        rangeEnd = end;
        cache = [];
        var fetchID = ++currentFetchID;
        var len = sources.length;
        pendingSourceCnt = len;
        for (var i=0; i<len; i++) {
            fetchEventSource(sources[i], fetchID);
        }
    }
    
    
    function fetchEventSource(source, fetchID) {
        _fetchEventSource(source, function(events) {
            if (fetchID == currentFetchID) {
                if (events) {

                    if (options.eventDataTransform) {
                        events = $.map(events, options.eventDataTransform);
                    }
                    if (source.eventDataTransform) {
                        events = $.map(events, source.eventDataTransform);
                    }
                    // TODO: this technique is not ideal for static array event sources.
                    //  For arrays, we'll want to process all events right in the beginning, then never again.
                
                    for (var i=0; i<events.length; i++) {
                        events[i].source = source;
                        normalizeEvent(events[i]);
                    }
                    cache = cache.concat(events);
                }
                pendingSourceCnt--;
                if (!pendingSourceCnt) {
                    reportEvents(cache);
                }
            }
        });
    }
    
    
    function _fetchEventSource(source, callback) {
        var i;
        var fetchers = fc.sourceFetchers;
        var res;
        for (i=0; i<fetchers.length; i++) {
            res = fetchers[i](source, rangeStart, rangeEnd, callback);
            if (res === true) {
                // the fetcher is in charge. made its own async request
                return;
            }
            else if (typeof res == 'object') {
                // the fetcher returned a new source. process it
                _fetchEventSource(res, callback);
                return;
            }
        }
        var events = source.events;
        if (events) {
            if ($.isFunction(events)) {
                pushLoading();
                events(cloneDate(rangeStart), cloneDate(rangeEnd), function(events) {
                    callback(events);
                    popLoading();
                });
            }
            else if ($.isArray(events)) {
                callback(events);
            }
            else {
                callback();
            }
        }else{
            var url = source.url;
            if (url) {
                var success = source.success;
                var error = source.error;
                var complete = source.complete;

                // retrieve any outbound GET/POST $.ajax data from the options
                var customData;
                if ($.isFunction(source.data)) {
                    // supplied as a function that returns a key/value object
                    customData = source.data();
                }
                else {
                    // supplied as a straight key/value object
                    customData = source.data;
                }

                // use a copy of the custom data so we can modify the parameters
                // and not affect the passed-in object.
                var data = $.extend({}, customData || {});

                var startParam = firstDefined(source.startParam, options.startParam);
                var endParam = firstDefined(source.endParam, options.endParam);
                if (startParam) {
                    data[startParam] = Math.round(+rangeStart / 1000);
                }
                if (endParam) {
                    data[endParam] = Math.round(+rangeEnd / 1000);
                }

                pushLoading();
                $.ajax($.extend({}, ajaxDefaults, source, {
                    data: data,
                    success: function(events) {
                        events = events || [];
                        var res = applyAll(success, this, arguments);
                        if ($.isArray(res)) {
                            events = res;
                        }
                        callback(events);
                    },
                    error: function() {
                        applyAll(error, this, arguments);
                        callback();
                    },
                    complete: function() {
                        applyAll(complete, this, arguments);
                        popLoading();
                    }
                }));
            }else{
                callback();
            }
        }
    }
    
    
    
    /* Sources
    -----------------------------------------------------------------------------*/
    

    function addEventSource(source) {
        source = _addEventSource(source);
        if (source) {
            pendingSourceCnt++;
            fetchEventSource(source, currentFetchID); // will eventually call reportEvents
        }
    }
    
    
    function _addEventSource(source) {
        if ($.isFunction(source) || $.isArray(source)) {
            source = { events: source };
        }
        else if (typeof source == 'string') {
            source = { url: source };
        }
        if (typeof source == 'object') {
            normalizeSource(source);
            sources.push(source);
            return source;
        }
    }
    

    function removeEventSource(source) {
        sources = $.grep(sources, function(src) {
            return !isSourcesEqual(src, source);
        });
        // remove all client events from that source
        cache = $.grep(cache, function(e) {
            return !isSourcesEqual(e.source, source);
        });
        reportEvents(cache);
    }
    
    
    
    /* Manipulation
    -----------------------------------------------------------------------------*/
    
    
    function updateEvent(event) { // update an existing event
        var i, len = cache.length, e,
            defaultEventEnd = getView().defaultEventEnd, // getView???
            startDelta = event.start - event._start,
            endDelta = event.end ?
                (event.end - (event._end || defaultEventEnd(event))) // event._end would be null if event.end
                : 0;                                                      // was null and event was just resized
        for (i=0; i<len; i++) {
            e = cache[i];
            if (e._id == event._id && e != event) {
                e.start = new Date(+e.start + startDelta);
                if (event.end) {
                    if (e.end) {
                        e.end = new Date(+e.end + endDelta);
                    }else{
                        e.end = new Date(+defaultEventEnd(e) + endDelta);
                    }
                }else{
                    e.end = null;
                }
                e.title = event.title;
                e.url = event.url;
                e.allDay = event.allDay;
                e.className = event.className;
                e.editable = event.editable;
                e.color = event.color;
                e.backgroundColor = event.backgroundColor;
                e.borderColor = event.borderColor;
                e.textColor = event.textColor;
                normalizeEvent(e);
            }
        }
        normalizeEvent(event);
        reportEvents(cache);
    }
    
    
    function renderEvent(event, stick) {
        normalizeEvent(event);
        if (!event.source) {
            if (stick) {
                stickySource.events.push(event);
                event.source = stickySource;
            }
            cache.push(event);
        }
        reportEvents(cache);
    }
    
    
    function removeEvents(filter) {
        if (!filter) { // remove all
            cache = [];
            // clear all array sources
            for (var i=0; i<sources.length; i++) {
                if ($.isArray(sources[i].events)) {
                    sources[i].events = [];
                }
            }
        }else{
            if (!$.isFunction(filter)) { // an event ID
                var id = filter + '';
                filter = function(e) {
                    return e._id == id;
                };
            }
            cache = $.grep(cache, filter, true);
            // remove events from array sources
            for (var i=0; i<sources.length; i++) {
                if ($.isArray(sources[i].events)) {
                    sources[i].events = $.grep(sources[i].events, filter, true);
                }
            }
        }
        reportEvents(cache);
    }
    
    
    function clientEvents(filter) {
        if ($.isFunction(filter)) {
            return $.grep(cache, filter);
        }
        else if (filter) { // an event ID
            filter += '';
            return $.grep(cache, function(e) {
                return e._id == filter;
            });
        }
        return cache; // else, return all
    }
    
    
    
    /* Loading State
    -----------------------------------------------------------------------------*/
    
    
    function pushLoading() {
        if (!loadingLevel++) {
            trigger('loading', null, true, getView());
        }
    }
    
    
    function popLoading() {
        if (!--loadingLevel) {
            trigger('loading', null, false, getView());
        }
    }
    
    
    
    /* Event Normalization
    -----------------------------------------------------------------------------*/
    
    
    function normalizeEvent(event) {
        var source = event.source || {};
        var ignoreTimezone = firstDefined(source.ignoreTimezone, options.ignoreTimezone);
        event._id = event._id || (event.id === undefined ? '_fc' + eventGUID++ : event.id + '');
        if (event.date) {
            if (!event.start) {
                event.start = event.date;
            }
            delete event.date;
        }
        event._start = cloneDate(event.start = parseDate(event.start, ignoreTimezone));
        event.end = parseDate(event.end, ignoreTimezone);
        if (event.end && event.end <= event.start) {
            event.end = null;
        }
        event._end = event.end ? cloneDate(event.end) : null;
        if (event.allDay === undefined) {
            event.allDay = firstDefined(source.allDayDefault, options.allDayDefault);
        }
        if (event.className) {
            if (typeof event.className == 'string') {
                event.className = event.className.split(/\s+/);
            }
        }else{
            event.className = [];
        }
        // TODO: if there is no start date, return false to indicate an invalid event
    }
    
    
    
    /* Utils
    ------------------------------------------------------------------------------*/
    
    
    function normalizeSource(source) {
        if (source.className) {
            // TODO: repeat code, same code for event classNames
            if (typeof source.className == 'string') {
                source.className = source.className.split(/\s+/);
            }
        }else{
            source.className = [];
        }
        var normalizers = fc.sourceNormalizers;
        for (var i=0; i<normalizers.length; i++) {
            normalizers[i](source);
        }
    }
    
    
    function isSourcesEqual(source1, source2) {
        return source1 && source2 && getSourcePrimitive(source1) == getSourcePrimitive(source2);
    }
    
    
    function getSourcePrimitive(source) {
        return ((typeof source == 'object') ? (source.googleCalendarId || source.events || source.url) : '') || source;
    }


}




fc.addDays = addDays;
fc.cloneDate = cloneDate;
fc.parseDate = parseDate;
fc.parseISO8601 = parseISO8601;
fc.parseTime = parseTime;
fc.formatDate = formatDate;
fc.formatDates = formatDates;



/* Date Math
-----------------------------------------------------------------------------*/

var dayIDs = ['sun', 'mon', 'tue', 'wed', 'thu', 'fri', 'sat'],
    DAY_MS = 86400000,
    HOUR_MS = 3600000,
    MINUTE_MS = 60000;
    

function addYears(d, n, keepTime) {
    d.setFullYear(d.getFullYear() + n);
    if (!keepTime) {
        clearTime(d);
    }
    return d;
}


function addMonths(d, n, keepTime) { // prevents day overflow/underflow
    if (+d) { // prevent infinite looping on invalid dates
        var m = d.getMonth() + n,
            check = cloneDate(d);
        check.setDate(1);
        check.setMonth(m);
        d.setMonth(m);
        if (!keepTime) {
            clearTime(d);
        }
        while (d.getMonth() != check.getMonth()) {
            d.setDate(d.getDate() + (d < check ? 1 : -1));
        }
    }
    return d;
}


function addDays(d, n, keepTime) { // deals with daylight savings
    if (+d) {
        var dd = d.getDate() + n,
            check = cloneDate(d);
        check.setHours(9); // set to middle of day
        check.setDate(dd);
        d.setDate(dd);
        if (!keepTime) {
            clearTime(d);
        }
        fixDate(d, check);
    }
    return d;
}


function fixDate(d, check) { // force d to be on check's YMD, for daylight savings purposes
    if (+d) { // prevent infinite looping on invalid dates
        while (d.getDate() != check.getDate()) {
            d.setTime(+d + (d < check ? 1 : -1) * HOUR_MS);
        }
    }
}


function addMinutes(d, n) {
    d.setMinutes(d.getMinutes() + n);
    return d;
}


function clearTime(d) {
    d.setHours(0);
    d.setMinutes(0);
    d.setSeconds(0); 
    d.setMilliseconds(0);
    return d;
}


function cloneDate(d, dontKeepTime) {
    if (dontKeepTime) {
        return clearTime(new Date(+d));
    }
    return new Date(+d);
}


function zeroDate() { // returns a Date with time 00:00:00 and dateOfMonth=1
    var i=0, d;
    do {
        d = new Date(1970, i++, 1);
    } while (d.getHours()); // != 0
    return d;
}


function dayDiff(d1, d2) { // d1 - d2
    return Math.round((cloneDate(d1, true) - cloneDate(d2, true)) / DAY_MS);
}


function setYMD(date, y, m, d) {
    if (y !== undefined && y != date.getFullYear()) {
        date.setDate(1);
        date.setMonth(0);
        date.setFullYear(y);
    }
    if (m !== undefined && m != date.getMonth()) {
        date.setDate(1);
        date.setMonth(m);
    }
    if (d !== undefined) {
        date.setDate(d);
    }
}



/* Date Parsing
-----------------------------------------------------------------------------*/


function parseDate(s, ignoreTimezone) { // ignoreTimezone defaults to true
    if (typeof s == 'object') { // already a Date object
        return s;
    }
    if (typeof s == 'number') { // a UNIX timestamp
        return new Date(s * 1000);
    }
    if (typeof s == 'string') {
        if (s.match(/^\d+(\.\d+)?$/)) { // a UNIX timestamp
            return new Date(parseFloat(s) * 1000);
        }
        if (ignoreTimezone === undefined) {
            ignoreTimezone = true;
        }
        return parseISO8601(s, ignoreTimezone) || (s ? new Date(s) : null);
    }
    // TODO: never return invalid dates (like from new Date(<string>)), return null instead
    return null;
}


function parseISO8601(s, ignoreTimezone) { // ignoreTimezone defaults to false
    // derived from http://delete.me.uk/2005/03/iso8601.html
    // TODO: for a know glitch/feature, read tests/issue_206_parseDate_dst.html
    var m = s.match(/^([0-9]{4})(-([0-9]{2})(-([0-9]{2})([T ]([0-9]{2}):([0-9]{2})(:([0-9]{2})(\.([0-9]+))?)?(Z|(([-+])([0-9]{2})(:?([0-9]{2}))?))?)?)?)?$/);
    if (!m) {
        return null;
    }
    var date = new Date(m[1], 0, 1);
    if (ignoreTimezone || !m[13]) {
        var check = new Date(m[1], 0, 1, 9, 0);
        if (m[3]) {
            date.setMonth(m[3] - 1);
            check.setMonth(m[3] - 1);
        }
        if (m[5]) {
            date.setDate(m[5]);
            check.setDate(m[5]);
        }
        fixDate(date, check);
        if (m[7]) {
            date.setHours(m[7]);
        }
        if (m[8]) {
            date.setMinutes(m[8]);
        }
        if (m[10]) {
            date.setSeconds(m[10]);
        }
        if (m[12]) {
            date.setMilliseconds(Number("0." + m[12]) * 1000);
        }
        fixDate(date, check);
    }else{
        date.setUTCFullYear(
            m[1],
            m[3] ? m[3] - 1 : 0,
            m[5] || 1
        );
        date.setUTCHours(
            m[7] || 0,
            m[8] || 0,
            m[10] || 0,
            m[12] ? Number("0." + m[12]) * 1000 : 0
        );
        if (m[14]) {
            var offset = Number(m[16]) * 60 + (m[18] ? Number(m[18]) : 0);
            offset *= m[15] == '-' ? 1 : -1;
            date = new Date(+date + (offset * 60 * 1000));
        }
    }
    return date;
}


function parseTime(s) { // returns minutes since start of day
    if (typeof s == 'number') { // an hour
        return s * 60;
    }
    if (typeof s == 'object') { // a Date object
        return s.getHours() * 60 + s.getMinutes();
    }
    var m = s.match(/(\d+)(?::(\d+))?\s*(\w+)?/);
    if (m) {
        var h = parseInt(m[1], 10);
        if (m[3]) {
            h %= 12;
            if (m[3].toLowerCase().charAt(0) == 'p') {
                h += 12;
            }
        }
        return h * 60 + (m[2] ? parseInt(m[2], 10) : 0);
    }
}



/* Date Formatting
-----------------------------------------------------------------------------*/
// TODO: use same function formatDate(date, [date2], format, [options])


function formatDate(date, format, options) {
    return formatDates(date, null, format, options);
}


function formatDates(date1, date2, format, options) {
    options = options || defaults;
    var date = date1,
        otherDate = date2,
        i, len = format.length, c,
        i2, formatter,
        res = '';
    for (i=0; i<len; i++) {
        c = format.charAt(i);
        if (c == "'") {
            for (i2=i+1; i2<len; i2++) {
                if (format.charAt(i2) == "'") {
                    if (date) {
                        if (i2 == i+1) {
                            res += "'";
                        }else{
                            res += format.substring(i+1, i2);
                        }
                        i = i2;
                    }
                    break;
                }
            }
        }
        else if (c == '(') {
            for (i2=i+1; i2<len; i2++) {
                if (format.charAt(i2) == ')') {
                    var subres = formatDate(date, format.substring(i+1, i2), options);
                    if (parseInt(subres.replace(/\D/, ''), 10)) {
                        res += subres;
                    }
                    i = i2;
                    break;
                }
            }
        }
        else if (c == '[') {
            for (i2=i+1; i2<len; i2++) {
                if (format.charAt(i2) == ']') {
                    var subformat = format.substring(i+1, i2);
                    var subres = formatDate(date, subformat, options);
                    if (subres != formatDate(otherDate, subformat, options)) {
                        res += subres;
                    }
                    i = i2;
                    break;
                }
            }
        }
        else if (c == '{') {
            date = date2;
            otherDate = date1;
        }
        else if (c == '}') {
            date = date1;
            otherDate = date2;
        }
        else {
            for (i2=len; i2>i; i2--) {
                if (formatter = dateFormatters[format.substring(i, i2)]) {
                    if (date) {
                        res += formatter(date, options);
                    }
                    i = i2 - 1;
                    break;
                }
            }
            if (i2 == i) {
                if (date) {
                    res += c;
                }
            }
        }
    }
    return res;
}


var dateFormatters = {
    s    : function(d)    { return d.getSeconds(); },
    ss    : function(d)    { return zeroPad(d.getSeconds()); },
    m    : function(d)    { return d.getMinutes(); },
    mm    : function(d)    { return zeroPad(d.getMinutes()); },
    h    : function(d)    { return d.getHours() % 12 || 12; },
    hh    : function(d)    { return zeroPad(d.getHours() % 12 || 12); },
    H    : function(d)    { return d.getHours(); },
    HH    : function(d)    { return zeroPad(d.getHours()); },
    d    : function(d)    { return d.getDate(); },
    dd    : function(d)    { return zeroPad(d.getDate()); },
    ddd    : function(d,o)    { return o.dayNamesShort[d.getDay()]; },
    dddd: function(d,o)    { return o.dayNames[d.getDay()]; },
    M    : function(d)    { return d.getMonth() + 1; },
    MM    : function(d)    { return zeroPad(d.getMonth() + 1); },
    MMM    : function(d,o)    { return o.monthNamesShort[d.getMonth()]; },
    MMMM: function(d,o)    { return o.monthNames[d.getMonth()]; },
    yy    : function(d)    { return (d.getFullYear()+'').substring(2); },
    yyyy: function(d)    { return d.getFullYear(); },
    t    : function(d)    { return d.getHours() < 12 ? 'a' : 'p'; },
    tt    : function(d)    { return d.getHours() < 12 ? 'am' : 'pm'; },
    T    : function(d)    { return d.getHours() < 12 ? 'A' : 'P'; },
    TT    : function(d)    { return d.getHours() < 12 ? 'AM' : 'PM'; },
    u    : function(d)    { return formatDate(d, "yyyy-MM-dd'T'HH:mm:ss'Z'"); },
    S    : function(d)    {
        var date = d.getDate();
        if (date > 10 && date < 20) {
            return 'th';
        }
        return ['st', 'nd', 'rd'][date%10-1] || 'th';
    },
    w   : function(d, o) { // local
        return o.weekNumberCalculation(d);
    },
    W   : function(d) { // ISO
        return iso8601Week(d);
    }
};
fc.dateFormatters = dateFormatters;


/* thanks jQuery UI (https://github.com/jquery/jquery-ui/blob/master/ui/jquery.ui.datepicker.js)
 * 
 * Set as calculateWeek to determine the week of the year based on the ISO 8601 definition.
 * `date` - the date to get the week for
 * `number` - the number of the week within the year that contains this date
 */
function iso8601Week(date) {
    var time;
    var checkDate = new Date(date.getTime());

    // Find Thursday of this week starting on Monday
    checkDate.setDate(checkDate.getDate() + 4 - (checkDate.getDay() || 7));

    time = checkDate.getTime();
    checkDate.setMonth(0); // Compare with Jan 1
    checkDate.setDate(1);
    return Math.floor(Math.round((time - checkDate) / 86400000) / 7) + 1;
}




fc.applyAll = applyAll;


/* Event Date Math
-----------------------------------------------------------------------------*/


function exclEndDay(event) {
    if (event.end) {
        return _exclEndDay(event.end, event.allDay);
    }else{
        return addDays(cloneDate(event.start), 1);
    }
}


function _exclEndDay(end, allDay) {
    end = cloneDate(end);
    return allDay || end.getHours() || end.getMinutes() ? addDays(end, 1) : clearTime(end);
    // why don't we check for seconds/ms too?
}



/* Event Element Binding
-----------------------------------------------------------------------------*/


function lazySegBind(container, segs, bindHandlers) {
    container.unbind('mouseover').mouseover(function(ev) {
        var parent=ev.target, e=ev.target,
            i, seg;
        while (parent != this) {
            e = parent;
            parent = parent.parentNode;
        }
        if ((i = e._fci) !== undefined) {
            e._fci = undefined;
            seg = segs[i];
            bindHandlers(seg.event, seg.element, seg);
            $(ev.target).trigger(ev);
        }
        ev.stopPropagation();
    });
}



/* Element Dimensions
-----------------------------------------------------------------------------*/


function setOuterWidth(element, width, includeMargins) {
    for (var i=0, e; i<element.length; i++) {
        e = $(element[i]);
        e.width(Math.max(0, width - hsides(e, includeMargins)));
    }
}


function setOuterHeight(element, height, includeMargins) {
    for (var i=0, e; i<element.length; i++) {
        e = $(element[i]);
        e.height(Math.max(0, height - vsides(e, includeMargins)));
    }
}


function hsides(element, includeMargins) {
    return hpadding(element) + hborders(element) + (includeMargins ? hmargins(element) : 0);
}


function hpadding(element) {
    return (parseFloat($.css(element[0], 'paddingLeft', true)) || 0) +
           (parseFloat($.css(element[0], 'paddingRight', true)) || 0);
}


function hmargins(element) {
    return (parseFloat($.css(element[0], 'marginLeft', true)) || 0) +
           (parseFloat($.css(element[0], 'marginRight', true)) || 0);
}


function hborders(element) {
    return (parseFloat($.css(element[0], 'borderLeftWidth', true)) || 0) +
           (parseFloat($.css(element[0], 'borderRightWidth', true)) || 0);
}


function vsides(element, includeMargins) {
    return vpadding(element) +  vborders(element) + (includeMargins ? vmargins(element) : 0);
}


function vpadding(element) {
    return (parseFloat($.css(element[0], 'paddingTop', true)) || 0) +
           (parseFloat($.css(element[0], 'paddingBottom', true)) || 0);
}


function vmargins(element) {
    return (parseFloat($.css(element[0], 'marginTop', true)) || 0) +
           (parseFloat($.css(element[0], 'marginBottom', true)) || 0);
}


function vborders(element) {
    return (parseFloat($.css(element[0], 'borderTopWidth', true)) || 0) +
           (parseFloat($.css(element[0], 'borderBottomWidth', true)) || 0);
}



/* Misc Utils
-----------------------------------------------------------------------------*/


//TODO: arraySlice
//TODO: isFunction, grep ?


function noop() { }


function dateCompare(a, b) {
    return a - b;
}


function arrayMax(a) {
    return Math.max.apply(Math, a);
}


function zeroPad(n) {
    return (n < 10 ? '0' : '') + n;
}


function smartProperty(obj, name) { // get a camel-cased/namespaced property of an object
    if (obj[name] !== undefined) {
        return obj[name];
    }
    var parts = name.split(/(?=[A-Z])/),
        i=parts.length-1, res;
    for (; i>=0; i--) {
        res = obj[parts[i].toLowerCase()];
        if (res !== undefined) {
            return res;
        }
    }
    return obj[''];
}


function htmlEscape(s) {
    return s.replace(/&/g, '&amp;')
        .replace(/</g, '&lt;')
        .replace(/>/g, '&gt;')
        .replace(/'/g, '&#039;')
        .replace(/"/g, '&quot;')
        .replace(/\n/g, '<br />');
}


function disableTextSelection(element) {
    element
        .attr('unselectable', 'on')
        .css('MozUserSelect', 'none')
        .bind('selectstart.ui', function() { return false; });
}


/*
function enableTextSelection(element) {
    element
        .attr('unselectable', 'off')
        .css('MozUserSelect', '')
        .unbind('selectstart.ui');
}
*/


function markFirstLast(e) {
    e.children()
        .removeClass('fc-first fc-last')
        .filter(':first-child')
            .addClass('fc-first')
        .end()
        .filter(':last-child')
            .addClass('fc-last');
}


function setDayID(cell, date) {
    cell.each(function(i, _cell) {
        _cell.className = _cell.className.replace(/^fc-\w*/, 'fc-' + dayIDs[date.getDay()]);
        // TODO: make a way that doesn't rely on order of classes
    });
}


function getSkinCss(event, opt) {
    var source = event.source || {};
    var eventColor = event.color;
    var sourceColor = source.color;
    var optionColor = opt('eventColor');
    var backgroundColor =
        event.backgroundColor ||
        eventColor ||
        source.backgroundColor ||
        sourceColor ||
        opt('eventBackgroundColor') ||
        optionColor;
    var borderColor =
        event.borderColor ||
        eventColor ||
        source.borderColor ||
        sourceColor ||
        opt('eventBorderColor') ||
        optionColor;
    var textColor =
        event.textColor ||
        source.textColor ||
        opt('eventTextColor');
    var statements = [];
    if (backgroundColor) {
        statements.push('background-color:' + backgroundColor);
    }
    if (borderColor) {
        statements.push('border-color:' + borderColor);
    }
    if (textColor) {
        statements.push('color:' + textColor);
    }
    return statements.join(';');
}


function applyAll(functions, thisObj, args) {
    if ($.isFunction(functions)) {
        functions = [ functions ];
    }
    if (functions) {
        var i;
        var ret;
        for (i=0; i<functions.length; i++) {
            ret = functions[i].apply(thisObj, args) || ret;
        }
        return ret;
    }
}


function firstDefined() {
    for (var i=0; i<arguments.length; i++) {
        if (arguments[i] !== undefined) {
            return arguments[i];
        }
    }
}




fcViews.month = MonthView;

function MonthView(element, calendar) {
    var t = this;
    
    
    // exports
    t.render = render;
    
    
    // imports
    BasicView.call(t, element, calendar, 'month');
    var opt = t.opt;
    var renderBasic = t.renderBasic;
    var skipHiddenDays = t.skipHiddenDays;
    var getCellsPerWeek = t.getCellsPerWeek;
    var formatDate = calendar.formatDate;
    
    
    function render(date, delta) {

        if (delta) {
            addMonths(date, delta);
            date.setDate(1);
        }

        var firstDay = opt('firstDay');

        var start = cloneDate(date, true);
        start.setDate(1);

        var end = addMonths(cloneDate(start), 1);

        var visStart = cloneDate(start);
        addDays(visStart, -((visStart.getDay() - firstDay + 7) % 7));
        skipHiddenDays(visStart);

        var visEnd = cloneDate(end);
        addDays(visEnd, (7 - visEnd.getDay() + firstDay) % 7);
        skipHiddenDays(visEnd, -1, true);

        var colCnt = getCellsPerWeek();
        var rowCnt = Math.round(dayDiff(visEnd, visStart) / 7); // should be no need for Math.round

        if (opt('weekMode') == 'fixed') {
            addDays(visEnd, (6 - rowCnt) * 7); // add weeks to make up for it
            rowCnt = 6;
        }

        t.title = formatDate(start, opt('titleFormat'));

        t.start = start;
        t.end = end;
        t.visStart = visStart;
        t.visEnd = visEnd;

        renderBasic(rowCnt, colCnt, true);
    }
    
    
}



fcViews.basicWeek = BasicWeekView;

function BasicWeekView(element, calendar) {
    var t = this;
    
    
    // exports
    t.render = render;
    
    
    // imports
    BasicView.call(t, element, calendar, 'basicWeek');
    var opt = t.opt;
    var renderBasic = t.renderBasic;
    var skipHiddenDays = t.skipHiddenDays;
    var getCellsPerWeek = t.getCellsPerWeek;
    var formatDates = calendar.formatDates;
    
    
    function render(date, delta) {

        if (delta) {
            addDays(date, delta * 7);
        }

        var start = addDays(cloneDate(date), -((date.getDay() - opt('firstDay') + 7) % 7));
        var end = addDays(cloneDate(start), 7);

        var visStart = cloneDate(start);
        skipHiddenDays(visStart);

        var visEnd = cloneDate(end);
        skipHiddenDays(visEnd, -1, true);

        var colCnt = getCellsPerWeek();

        t.start = start;
        t.end = end;
        t.visStart = visStart;
        t.visEnd = visEnd;

        t.title = formatDates(
            visStart,
            addDays(cloneDate(visEnd), -1),
            opt('titleFormat')
        );

        renderBasic(1, colCnt, false);
    }
    
    
}



fcViews.basicDay = BasicDayView;


function BasicDayView(element, calendar) {
    var t = this;
    
    
    // exports
    t.render = render;
    
    
    // imports
    BasicView.call(t, element, calendar, 'basicDay');
    var opt = t.opt;
    var renderBasic = t.renderBasic;
    var skipHiddenDays = t.skipHiddenDays;
    var formatDate = calendar.formatDate;
    
    
    function render(date, delta) {

        if (delta) {
            addDays(date, delta);
        }
        skipHiddenDays(date, delta < 0 ? -1 : 1);

        var start = cloneDate(date, true);
        var end = addDays(cloneDate(start), 1);

        t.title = formatDate(date, opt('titleFormat'));

        t.start = t.visStart = start;
        t.end = t.visEnd = end;

        renderBasic(1, 1, false);
    }
    
    
}



setDefaults({
    weekMode: 'fixed'
});


function BasicView(element, calendar, viewName) {
    var t = this;
    
    
    // exports
    t.renderBasic = renderBasic;
    t.setHeight = setHeight;
    t.setWidth = setWidth;
    t.renderDayOverlay = renderDayOverlay;
    t.defaultSelectionEnd = defaultSelectionEnd;
    t.renderSelection = renderSelection;
    t.clearSelection = clearSelection;
    t.reportDayClick = reportDayClick; // for selection (kinda hacky)
    t.dragStart = dragStart;
    t.dragStop = dragStop;
    t.defaultEventEnd = defaultEventEnd;
    t.getHoverListener = function() { return hoverListener; };
    t.colLeft = colLeft;
    t.colRight = colRight;
    t.colContentLeft = colContentLeft;
    t.colContentRight = colContentRight;
    t.getIsCellAllDay = function() { return true; };
    t.allDayRow = allDayRow;
    t.getRowCnt = function() { return rowCnt; };
    t.getColCnt = function() { return colCnt; };
    t.getColWidth = function() { return colWidth; };
    t.getDaySegmentContainer = function() { return daySegmentContainer; };
    
    
    // imports
    View.call(t, element, calendar, viewName);
    OverlayManager.call(t);
    SelectionManager.call(t);
    BasicEventRenderer.call(t);
    var opt = t.opt;
    var trigger = t.trigger;
    var renderOverlay = t.renderOverlay;
    var clearOverlays = t.clearOverlays;
    var daySelectionMousedown = t.daySelectionMousedown;
    var cellToDate = t.cellToDate;
    var dateToCell = t.dateToCell;
    var rangeToSegments = t.rangeToSegments;
    var formatDate = calendar.formatDate;
    
    
    // locals
    
    var table;
    var head;
    var headCells;
    var body;
    var bodyRows;
    var bodyCells;
    var bodyFirstCells;
    var firstRowCellInners;
    var firstRowCellContentInners;
    var daySegmentContainer;
    
    var viewWidth;
    var viewHeight;
    var colWidth;
    var weekNumberWidth;
    
    var rowCnt, colCnt;
    var showNumbers;
    var coordinateGrid;
    var hoverListener;
    var colPositions;
    var colContentPositions;
    
    var tm;
    var colFormat;
    var showWeekNumbers;
    var weekNumberTitle;
    var weekNumberFormat;
    
    
    
    /* Rendering
    ------------------------------------------------------------*/
    
    
    disableTextSelection(element.addClass('fc-grid'));
    
    
    function renderBasic(_rowCnt, _colCnt, _showNumbers) {
        rowCnt = _rowCnt;
        colCnt = _colCnt;
        showNumbers = _showNumbers;
        updateOptions();

        if (!body) {
            buildEventContainer();
        }

        buildTable();
    }
    
    
    function updateOptions() {
        tm = opt('theme') ? 'ui' : 'fc';
        colFormat = opt('columnFormat');

        // week # options. (TODO: bad, logic also in other views)
        showWeekNumbers = opt('weekNumbers');
        weekNumberTitle = opt('weekNumberTitle');
        if (opt('weekNumberCalculation') != 'iso') {
            weekNumberFormat = "w";
        }
        else {
            weekNumberFormat = "W";
        }
    }
    
    
    function buildEventContainer() {
        daySegmentContainer =
            $("<div class='fc-event-container' style='position:absolute;z-index:8;top:0;left:0'/>")
                .appendTo(element);
    }
    
    
    function buildTable() {
        var html = buildTableHTML();

        if (table) {
            table.remove();
        }
        table = $(html).appendTo(element);

        head = table.find('thead');
        headCells = head.find('.fc-day-header');
        body = table.find('tbody');
        bodyRows = body.find('tr');
        bodyCells = body.find('.fc-day');
        bodyFirstCells = bodyRows.find('td:first-child');

        firstRowCellInners = bodyRows.eq(0).find('.fc-day > div');
        firstRowCellContentInners = bodyRows.eq(0).find('.fc-day-content > div');
        
        markFirstLast(head.add(head.find('tr'))); // marks first+last tr/th's
        markFirstLast(bodyRows); // marks first+last td's
        bodyRows.eq(0).addClass('fc-first');
        bodyRows.filter(':last').addClass('fc-last');

        bodyCells.each(function(i, _cell) {
            var date = cellToDate(
                Math.floor(i / colCnt),
                i % colCnt
            );
            trigger('dayRender', t, date, $(_cell));
        });

        dayBind(bodyCells);
    }



    /* HTML Building
    -----------------------------------------------------------*/


    function buildTableHTML() {
        var html =
            "<table class='fc-border-separate' style='width:100%' cellspacing='0'>" +
            buildHeadHTML() +
            buildBodyHTML() +
            "</table>";

        return html;
    }


    function buildHeadHTML() {
        var headerClass = tm + "-widget-header";
        var html = '';
        var col;
        var date;

        html += "<thead><tr>";

        if (showWeekNumbers) {
            html +=
                "<th class='fc-week-number " + headerClass + "'>" +
                htmlEscape(weekNumberTitle) +
                "</th>";
        }

        for (col=0; col<colCnt; col++) {
            date = cellToDate(0, col);
            html +=
                "<th class='fc-day-header fc-" + dayIDs[date.getDay()] + " " + headerClass + "'>" +
                htmlEscape(formatDate(date, colFormat)) +
                "</th>";
        }

        html += "</tr></thead>";

        return html;
    }


    function buildBodyHTML() {
        var contentClass = tm + "-widget-content";
        var html = '';
        var row;
        var col;
        var date;

        html += "<tbody>";

        for (row=0; row<rowCnt; row++) {

            html += "<tr class='fc-week'>";

            if (showWeekNumbers) {
                date = cellToDate(row, 0);
                html +=
                    "<td class='fc-week-number " + contentClass + "'>" +
                    "<div>" +
                    htmlEscape(formatDate(date, weekNumberFormat)) +
                    "</div>" +
                    "</td>";
            }

            for (col=0; col<colCnt; col++) {
                date = cellToDate(row, col);
                html += buildCellHTML(date);
            }

            html += "</tr>";
        }

        html += "</tbody>";

        return html;
    }


    function buildCellHTML(date) {
        var contentClass = tm + "-widget-content";
        var month = t.start.getMonth();
        var today = clearTime(new Date());
        var html = '';
        var classNames = [
            'fc-day',
            'fc-' + dayIDs[date.getDay()],
            contentClass
        ];

        if (date.getMonth() != month) {
            classNames.push('fc-other-month');
        }
        if (+date == +today) {
            classNames.push(
                'fc-today',
                tm + '-state-highlight'
            );
        }
        else if (date < today) {
            classNames.push('fc-past');
        }
        else {
            classNames.push('fc-future');
        }

        html +=
            "<td" +
            " class='" + classNames.join(' ') + "'" +
            " data-date='" + formatDate(date, 'yyyy-MM-dd') + "'" +
            ">" +
            "<div>";

        if (showNumbers) {
            html += "<div class='fc-day-number'>" + date.getDate() + "</div>";
        }

        html +=
            "<div class='fc-day-content'>" +
            "<div style='position:relative'>&nbsp;</div>" +
            "</div>" +
            "</div>" +
            "</td>";

        return html;
    }



    /* Dimensions
    -----------------------------------------------------------*/
    
    
    function setHeight(height) {
        viewHeight = height;
        
        var bodyHeight = viewHeight - head.height();
        var rowHeight;
        var rowHeightLast;
        var cell;
            
        if (opt('weekMode') == 'variable') {
            rowHeight = rowHeightLast = Math.floor(bodyHeight / (rowCnt==1 ? 2 : 6));
        }else{
            rowHeight = Math.floor(bodyHeight / rowCnt);
            rowHeightLast = bodyHeight - rowHeight * (rowCnt-1);
        }
        
        bodyFirstCells.each(function(i, _cell) {
            if (i < rowCnt) {
                cell = $(_cell);
                cell.find('> div').css(
                    'min-height',
                    (i==rowCnt-1 ? rowHeightLast : rowHeight) - vsides(cell)
                );
            }
        });
        
    }
    
    
    function setWidth(width) {
        viewWidth = width;
        colPositions.clear();
        colContentPositions.clear();

        weekNumberWidth = 0;
        if (showWeekNumbers) {
            weekNumberWidth = head.find('th.fc-week-number').outerWidth();
        }

        colWidth = Math.floor((viewWidth - weekNumberWidth) / colCnt);
        setOuterWidth(headCells.slice(0, -1), colWidth);
    }
    
    
    
    /* Day clicking and binding
    -----------------------------------------------------------*/
    
    
    function dayBind(days) {
        days.click(dayClick)
            .mousedown(daySelectionMousedown);
    }
    
    
    function dayClick(ev) {
        if (!opt('selectable')) { // if selectable, SelectionManager will worry about dayClick
            var date = parseISO8601($(this).data('date'));
            trigger('dayClick', this, date, true, ev);
        }
    }
    
    
    
    /* Semi-transparent Overlay Helpers
    ------------------------------------------------------*/
    // TODO: should be consolidated with AgendaView's methods


    function renderDayOverlay(overlayStart, overlayEnd, refreshCoordinateGrid) { // overlayEnd is exclusive

        if (refreshCoordinateGrid) {
            coordinateGrid.build();
        }

        var segments = rangeToSegments(overlayStart, overlayEnd);

        for (var i=0; i<segments.length; i++) {
            var segment = segments[i];
            dayBind(
                renderCellOverlay(
                    segment.row,
                    segment.leftCol,
                    segment.row,
                    segment.rightCol
                )
            );
        }
    }

    
    function renderCellOverlay(row0, col0, row1, col1) { // row1,col1 is inclusive
        var rect = coordinateGrid.rect(row0, col0, row1, col1, element);
        return renderOverlay(rect, element);
    }
    
    
    
    /* Selection
    -----------------------------------------------------------------------*/
    
    
    function defaultSelectionEnd(startDate, allDay) {
        return cloneDate(startDate);
    }
    
    
    function renderSelection(startDate, endDate, allDay) {
        renderDayOverlay(startDate, addDays(cloneDate(endDate), 1), true); // rebuild every time???
    }
    
    
    function clearSelection() {
        clearOverlays();
    }
    
    
    function reportDayClick(date, allDay, ev) {
        var cell = dateToCell(date);
        var _element = bodyCells[cell.row*colCnt + cell.col];
        trigger('dayClick', _element, date, allDay, ev);
    }
    
    
    
    /* External Dragging
    -----------------------------------------------------------------------*/
    
    
    function dragStart(_dragElement, ev, ui) {
        hoverListener.start(function(cell) {
            clearOverlays();
            if (cell) {
                renderCellOverlay(cell.row, cell.col, cell.row, cell.col);
            }
        }, ev);
    }
    
    
    function dragStop(_dragElement, ev, ui) {
        var cell = hoverListener.stop();
        clearOverlays();
        if (cell) {
            var d = cellToDate(cell);
            trigger('drop', _dragElement, d, true, ev, ui);
        }
    }
    
    
    
    /* Utilities
    --------------------------------------------------------*/
    
    
    function defaultEventEnd(event) {
        return cloneDate(event.start);
    }
    
    
    coordinateGrid = new CoordinateGrid(function(rows, cols) {
        var e, n, p;
        headCells.each(function(i, _e) {
            e = $(_e);
            n = e.offset().left;
            if (i) {
                p[1] = n;
            }
            p = [n];
            cols[i] = p;
        });
        p[1] = n + e.outerWidth();
        bodyRows.each(function(i, _e) {
            if (i < rowCnt) {
                e = $(_e);
                n = e.offset().top;
                if (i) {
                    p[1] = n;
                }
                p = [n];
                rows[i] = p;
            }
        });
        p[1] = n + e.outerHeight();
    });
    
    
    hoverListener = new HoverListener(coordinateGrid);
    
    colPositions = new HorizontalPositionCache(function(col) {
        return firstRowCellInners.eq(col);
    });

    colContentPositions = new HorizontalPositionCache(function(col) {
        return firstRowCellContentInners.eq(col);
    });


    function colLeft(col) {
        return colPositions.left(col);
    }


    function colRight(col) {
        return colPositions.right(col);
    }
    
    
    function colContentLeft(col) {
        return colContentPositions.left(col);
    }
    
    
    function colContentRight(col) {
        return colContentPositions.right(col);
    }
    
    
    function allDayRow(i) {
        return bodyRows.eq(i);
    }
    
}



function BasicEventRenderer() {
    var t = this;
    
    
    // exports
    t.renderEvents = renderEvents;
    t.clearEvents = clearEvents;
    

    // imports
    DayEventRenderer.call(t);

    
    function renderEvents(events, modifiedEventId) {
        t.renderDayEvents(events, modifiedEventId);
    }
    
    
    function clearEvents() {
        t.getDaySegmentContainer().empty();
    }


    // TODO: have this class (and AgendaEventRenderer) be responsible for creating the event container div

}



fcViews.agendaWeek = AgendaWeekView;

function AgendaWeekView(element, calendar) {
    var t = this;
    
    
    // exports
    t.render = render;
    
    
    // imports
    AgendaView.call(t, element, calendar, 'agendaWeek');
    var opt = t.opt;
    var renderAgenda = t.renderAgenda;
    var skipHiddenDays = t.skipHiddenDays;
    var getCellsPerWeek = t.getCellsPerWeek;
    var formatDates = calendar.formatDates;

    
    function render(date, delta) {

        if (delta) {
            addDays(date, delta * 7);
        }

        var start = addDays(cloneDate(date), -((date.getDay() - opt('firstDay') + 7) % 7));
        var end = addDays(cloneDate(start), 7);

        var visStart = cloneDate(start);
        skipHiddenDays(visStart);

        var visEnd = cloneDate(end);
        skipHiddenDays(visEnd, -1, true);

        var colCnt = getCellsPerWeek();

        t.title = formatDates(
            visStart,
            addDays(cloneDate(visEnd), -1),
            opt('titleFormat')
        );

        t.start = start;
        t.end = end;
        t.visStart = visStart;
        t.visEnd = visEnd;

        renderAgenda(colCnt);
    }

}



fcViews.agendaDay = AgendaDayView;


function AgendaDayView(element, calendar) {
    var t = this;
    
    
    // exports
    t.render = render;
    
    
    // imports
    AgendaView.call(t, element, calendar, 'agendaDay');
    var opt = t.opt;
    var renderAgenda = t.renderAgenda;
    var skipHiddenDays = t.skipHiddenDays;
    var formatDate = calendar.formatDate;
    
    
    function render(date, delta) {

        if (delta) {
            addDays(date, delta);
        }
        skipHiddenDays(date, delta < 0 ? -1 : 1);

        var start = cloneDate(date, true);
        var end = addDays(cloneDate(start), 1);

        t.title = formatDate(date, opt('titleFormat'));

        t.start = t.visStart = start;
        t.end = t.visEnd = end;

        renderAgenda(1);
    }
    

}



setDefaults({
    allDaySlot: true,
    allDayText: 'all-day',
    firstHour: 6,
    slotMinutes: 30,
    defaultEventMinutes: 120,
    axisFormat: 'h(:mm)tt',
    timeFormat: {
        agenda: 'h:mm{ - h:mm}'
    },
    dragOpacity: {
        agenda: .5
    },
    minTime: 0,
    maxTime: 24,
    slotEventOverlap: true
});


// TODO: make it work in quirks mode (event corners, all-day height)
// TODO: test liquid width, especially in IE6


function AgendaView(element, calendar, viewName) {
    var t = this;
    
    
    // exports
    t.renderAgenda = renderAgenda;
    t.setWidth = setWidth;
    t.setHeight = setHeight;
    t.afterRender = afterRender;
    t.defaultEventEnd = defaultEventEnd;
    t.timePosition = timePosition;
    t.getIsCellAllDay = getIsCellAllDay;
    t.allDayRow = getAllDayRow;
    t.getCoordinateGrid = function() { return coordinateGrid; }; // specifically for AgendaEventRenderer
    t.getHoverListener = function() { return hoverListener; };
    t.colLeft = colLeft;
    t.colRight = colRight;
    t.colContentLeft = colContentLeft;
    t.colContentRight = colContentRight;
    t.getDaySegmentContainer = function() { return daySegmentContainer; };
    t.getSlotSegmentContainer = function() { return slotSegmentContainer; };
    t.getMinMinute = function() { return minMinute; };
    t.getMaxMinute = function() { return maxMinute; };
    t.getSlotContainer = function() { return slotContainer; };
    t.getRowCnt = function() { return 1; };
    t.getColCnt = function() { return colCnt; };
    t.getColWidth = function() { return colWidth; };
    t.getSnapHeight = function() { return snapHeight; };
    t.getSnapMinutes = function() { return snapMinutes; };
    t.defaultSelectionEnd = defaultSelectionEnd;
    t.renderDayOverlay = renderDayOverlay;
    t.renderSelection = renderSelection;
    t.clearSelection = clearSelection;
    t.reportDayClick = reportDayClick; // selection mousedown hack
    t.dragStart = dragStart;
    t.dragStop = dragStop;
    
    
    // imports
    View.call(t, element, calendar, viewName);
    OverlayManager.call(t);
    SelectionManager.call(t);
    AgendaEventRenderer.call(t);
    var opt = t.opt;
    var trigger = t.trigger;
    var renderOverlay = t.renderOverlay;
    var clearOverlays = t.clearOverlays;
    var reportSelection = t.reportSelection;
    var unselect = t.unselect;
    var daySelectionMousedown = t.daySelectionMousedown;
    var slotSegHtml = t.slotSegHtml;
    var cellToDate = t.cellToDate;
    var dateToCell = t.dateToCell;
    var rangeToSegments = t.rangeToSegments;
    var formatDate = calendar.formatDate;
    
    
    // locals
    
    var dayTable;
    var dayHead;
    var dayHeadCells;
    var dayBody;
    var dayBodyCells;
    var dayBodyCellInners;
    var dayBodyCellContentInners;
    var dayBodyFirstCell;
    var dayBodyFirstCellStretcher;
    var slotLayer;
    var daySegmentContainer;
    var allDayTable;
    var allDayRow;
    var slotScroller;
    var slotContainer;
    var slotSegmentContainer;
    var slotTable;
    var selectionHelper;
    
    var viewWidth;
    var viewHeight;
    var axisWidth;
    var colWidth;
    var gutterWidth;
    var slotHeight; // TODO: what if slotHeight changes? (see issue 650)

    var snapMinutes;
    var snapRatio; // ratio of number of "selection" slots to normal slots. (ex: 1, 2, 4)
    var snapHeight; // holds the pixel hight of a "selection" slot
    
    var colCnt;
    var slotCnt;
    var coordinateGrid;
    var hoverListener;
    var colPositions;
    var colContentPositions;
    var slotTopCache = {};
    
    var tm;
    var rtl;
    var minMinute, maxMinute;
    var colFormat;
    var showWeekNumbers;
    var weekNumberTitle;
    var weekNumberFormat;
    

    
    /* Rendering
    -----------------------------------------------------------------------------*/
    
    
    disableTextSelection(element.addClass('fc-agenda'));
    
    
    function renderAgenda(c) {
        colCnt = c;
        updateOptions();

        if (!dayTable) { // first time rendering?
            buildSkeleton(); // builds day table, slot area, events containers
        }
        else {
            buildDayTable(); // rebuilds day table
        }
    }
    
    
    function updateOptions() {

        tm = opt('theme') ? 'ui' : 'fc';
        rtl = opt('isRTL');
        minMinute = parseTime(opt('minTime'));
        maxMinute = parseTime(opt('maxTime'));
        colFormat = opt('columnFormat');

        // week # options. (TODO: bad, logic also in other views)
        showWeekNumbers = opt('weekNumbers');
        weekNumberTitle = opt('weekNumberTitle');
        if (opt('weekNumberCalculation') != 'iso') {
            weekNumberFormat = "w";
        }
        else {
            weekNumberFormat = "W";
        }

        snapMinutes = opt('snapMinutes') || opt('slotMinutes');
    }



    /* Build DOM
    -----------------------------------------------------------------------*/


    function buildSkeleton() {
        var headerClass = tm + "-widget-header";
        var contentClass = tm + "-widget-content";
        var s;
        var d;
        var i;
        var maxd;
        var minutes;
        var slotNormal = opt('slotMinutes') % 15 == 0;
        
        buildDayTable();
        
        slotLayer =
            $("<div style='position:absolute;z-index:2;left:0;width:100%'/>")
                .appendTo(element);
                
        if (opt('allDaySlot')) {
        
            daySegmentContainer =
                $("<div class='fc-event-container' style='position:absolute;z-index:8;top:0;left:0'/>")
                    .appendTo(slotLayer);
        
            s =
                "<table style='width:100%' class='fc-agenda-allday' cellspacing='0'>" +
                "<tr>" +
                "<th class='" + headerClass + " fc-agenda-axis'>" + opt('allDayText') + "</th>" +
                "<td>" +
                "<div class='fc-day-content'><div style='position:relative'/></div>" +
                "</td>" +
                "<th class='" + headerClass + " fc-agenda-gutter'>&nbsp;</th>" +
                "</tr>" +
                "</table>";
            allDayTable = $(s).appendTo(slotLayer);
            allDayRow = allDayTable.find('tr');
            
            dayBind(allDayRow.find('td'));
            
            slotLayer.append(
                "<div class='fc-agenda-divider " + headerClass + "'>" +
                "<div class='fc-agenda-divider-inner'/>" +
                "</div>"
            );
            
        }else{
        
            daySegmentContainer = $([]); // in jQuery 1.4, we can just do $()
        
        }
        
        slotScroller =
            $("<div style='position:absolute;width:100%;overflow-x:hidden;overflow-y:auto'/>")
                .appendTo(slotLayer);
                
        slotContainer =
            $("<div style='position:relative;width:100%;overflow:hidden'/>")
                .appendTo(slotScroller);
                
        slotSegmentContainer =
            $("<div class='fc-event-container' style='position:absolute;z-index:8;top:0;left:0'/>")
                .appendTo(slotContainer);
        
        s =
            "<table class='fc-agenda-slots' style='width:100%' cellspacing='0'>" +
            "<tbody>";
        d = zeroDate();
        maxd = addMinutes(cloneDate(d), maxMinute);
        addMinutes(d, minMinute);
        slotCnt = 0;
        for (i=0; d < maxd; i++) {
            minutes = d.getMinutes();
            s +=
                "<tr class='fc-slot" + i + ' ' + (!minutes ? '' : 'fc-minor') + "'>" +
                "<th class='fc-agenda-axis " + headerClass + "'>" +
                ((!slotNormal || !minutes) ? formatDate(d, opt('axisFormat')) : '&nbsp;') +
                "</th>" +
                "<td class='" + contentClass + "'>" +
                "<div style='position:relative'>&nbsp;</div>" +
                "</td>" +
                "</tr>";
            addMinutes(d, opt('slotMinutes'));
            slotCnt++;
        }
        s +=
            "</tbody>" +
            "</table>";
        slotTable = $(s).appendTo(slotContainer);
        
        slotBind(slotTable.find('td'));
    }



    /* Build Day Table
    -----------------------------------------------------------------------*/


    function buildDayTable() {
        var html = buildDayTableHTML();

        if (dayTable) {
            dayTable.remove();
        }
        dayTable = $(html).appendTo(element);

        dayHead = dayTable.find('thead');
        dayHeadCells = dayHead.find('th').slice(1, -1); // exclude gutter
        dayBody = dayTable.find('tbody');
        dayBodyCells = dayBody.find('td').slice(0, -1); // exclude gutter
        dayBodyCellInners = dayBodyCells.find('> div');
        dayBodyCellContentInners = dayBodyCells.find('.fc-day-content > div');

        dayBodyFirstCell = dayBodyCells.eq(0);
        dayBodyFirstCellStretcher = dayBodyCellInners.eq(0);
        
        markFirstLast(dayHead.add(dayHead.find('tr')));
        markFirstLast(dayBody.add(dayBody.find('tr')));

        // TODO: now that we rebuild the cells every time, we should call dayRender
    }


    function buildDayTableHTML() {
        var html =
            "<table style='width:100%' class='fc-agenda-days fc-border-separate' cellspacing='0'>" +
            buildDayTableHeadHTML() +
            buildDayTableBodyHTML() +
            "</table>";

        return html;
    }


    function buildDayTableHeadHTML() {
        var headerClass = tm + "-widget-header";
        var date;
        var html = '';
        var weekText;
        var col;

        html +=
            "<thead>" +
            "<tr>";

        if (showWeekNumbers) {
            date = cellToDate(0, 0);
            weekText = formatDate(date, weekNumberFormat);
            if (rtl) {
                weekText += weekNumberTitle;
            }
            else {
                weekText = weekNumberTitle + weekText;
            }
            html +=
                "<th class='fc-agenda-axis fc-week-number " + headerClass + "'>" +
                htmlEscape(weekText) +
                "</th>";
        }
        else {
            html += "<th class='fc-agenda-axis " + headerClass + "'>&nbsp;</th>";
        }

        for (col=0; col<colCnt; col++) {
            date = cellToDate(0, col);
            html +=
                "<th class='fc-" + dayIDs[date.getDay()] + " fc-col" + col + ' ' + headerClass + "'>" +
                htmlEscape(formatDate(date, colFormat)) +
                "</th>";
        }

        html +=
            "<th class='fc-agenda-gutter " + headerClass + "'>&nbsp;</th>" +
            "</tr>" +
            "</thead>";

        return html;
    }


    function buildDayTableBodyHTML() {
        var headerClass = tm + "-widget-header"; // TODO: make these when updateOptions() called
        var contentClass = tm + "-widget-content";
        var date;
        var today = clearTime(new Date());
        var col;
        var cellsHTML;
        var cellHTML;
        var classNames;
        var html = '';

        html +=
            "<tbody>" +
            "<tr>" +
            "<th class='fc-agenda-axis " + headerClass + "'>&nbsp;</th>";

        cellsHTML = '';

        for (col=0; col<colCnt; col++) {

            date = cellToDate(0, col);

            classNames = [
                'fc-col' + col,
                'fc-' + dayIDs[date.getDay()],
                contentClass
            ];
            if (+date == +today) {
                classNames.push(
                    tm + '-state-highlight',
                    'fc-today'
                );
            }
            else if (date < today) {
                classNames.push('fc-past');
            }
            else {
                classNames.push('fc-future');
            }

            cellHTML =
                "<td class='" + classNames.join(' ') + "'>" +
                "<div>" +
                "<div class='fc-day-content'>" +
                "<div style='position:relative'>&nbsp;</div>" +
                "</div>" +
                "</div>" +
                "</td>";

            cellsHTML += cellHTML;
        }

        html += cellsHTML;
        html +=
            "<td class='fc-agenda-gutter " + contentClass + "'>&nbsp;</td>" +
            "</tr>" +
            "</tbody>";

        return html;
    }


    // TODO: data-date on the cells

    
    
    /* Dimensions
    -----------------------------------------------------------------------*/

    
    function setHeight(height) {
        if (height === undefined) {
            height = viewHeight;
        }
        viewHeight = height;
        slotTopCache = {};
    
        var headHeight = dayBody.position().top;
        var allDayHeight = slotScroller.position().top; // including divider
        var bodyHeight = Math.min( // total body height, including borders
            height - headHeight,   // when scrollbars
            slotTable.height() + allDayHeight + 1 // when no scrollbars. +1 for bottom border
        );

        dayBodyFirstCellStretcher
            .height(bodyHeight - vsides(dayBodyFirstCell));
        
        slotLayer.css('top', headHeight);
        
        slotScroller.height(bodyHeight - allDayHeight - 1);
        
        // the stylesheet guarantees that the first row has no border.
        // this allows .height() to work well cross-browser.
        slotHeight = slotTable.find('tr:first').height() + 1; // +1 for bottom border

        snapRatio = opt('slotMinutes') / snapMinutes;
        snapHeight = slotHeight / snapRatio;
    }
    
    
    function setWidth(width) {
        viewWidth = width;
        colPositions.clear();
        colContentPositions.clear();

        var axisFirstCells = dayHead.find('th:first');
        if (allDayTable) {
            axisFirstCells = axisFirstCells.add(allDayTable.find('th:first'));
        }
        axisFirstCells = axisFirstCells.add(slotTable.find('th:first'));
        
        axisWidth = 0;
        setOuterWidth(
            axisFirstCells
                .width('')
                .each(function(i, _cell) {
                    axisWidth = Math.max(axisWidth, $(_cell).outerWidth());
                }),
            axisWidth
        );
        
        var gutterCells = dayTable.find('.fc-agenda-gutter');
        if (allDayTable) {
            gutterCells = gutterCells.add(allDayTable.find('th.fc-agenda-gutter'));
        }

        var slotTableWidth = slotScroller[0].clientWidth; // needs to be done after axisWidth (for IE7)
        
        gutterWidth = slotScroller.width() - slotTableWidth;
        if (gutterWidth) {
            setOuterWidth(gutterCells, gutterWidth);
            gutterCells
                .show()
                .prev()
                .removeClass('fc-last');
        }else{
            gutterCells
                .hide()
                .prev()
                .addClass('fc-last');
        }
        
        colWidth = Math.floor((slotTableWidth - axisWidth) / colCnt);
        setOuterWidth(dayHeadCells.slice(0, -1), colWidth);
    }
    


    /* Scrolling
    -----------------------------------------------------------------------*/


    function resetScroll() {
        var d0 = zeroDate();
        var scrollDate = cloneDate(d0);
        scrollDate.setHours(opt('firstHour'));
        var top = timePosition(d0, scrollDate) + 1; // +1 for the border
        function scroll() {
            slotScroller.scrollTop(top);
        }
        scroll();
        setTimeout(scroll, 0); // overrides any previous scroll state made by the browser
    }


    function afterRender() { // after the view has been freshly rendered and sized
        resetScroll();
    }
    
    
    
    /* Slot/Day clicking and binding
    -----------------------------------------------------------------------*/
    

    function dayBind(cells) {
        cells.click(slotClick)
            .mousedown(daySelectionMousedown);
    }


    function slotBind(cells) {
        cells.click(slotClick)
            .mousedown(slotSelectionMousedown);
    }
    
    
    function slotClick(ev) {
        if (!opt('selectable')) { // if selectable, SelectionManager will worry about dayClick
            var col = Math.min(colCnt-1, Math.floor((ev.pageX - dayTable.offset().left - axisWidth) / colWidth));
            var date = cellToDate(0, col);
            var rowMatch = this.parentNode.className.match(/fc-slot(\d+)/); // TODO: maybe use data
            if (rowMatch) {
                var mins = parseInt(rowMatch[1]) * opt('slotMinutes');
                var hours = Math.floor(mins/60);
                date.setHours(hours);
                date.setMinutes(mins%60 + minMinute);
                trigger('dayClick', dayBodyCells[col], date, false, ev);
            }else{
                trigger('dayClick', dayBodyCells[col], date, true, ev);
            }
        }
    }
    
    
    
    /* Semi-transparent Overlay Helpers
    -----------------------------------------------------*/
    // TODO: should be consolidated with BasicView's methods


    function renderDayOverlay(overlayStart, overlayEnd, refreshCoordinateGrid) { // overlayEnd is exclusive

        if (refreshCoordinateGrid) {
            coordinateGrid.build();
        }

        var segments = rangeToSegments(overlayStart, overlayEnd);

        for (var i=0; i<segments.length; i++) {
            var segment = segments[i];
            dayBind(
                renderCellOverlay(
                    segment.row,
                    segment.leftCol,
                    segment.row,
                    segment.rightCol
                )
            );
        }
    }
    
    
    function renderCellOverlay(row0, col0, row1, col1) { // only for all-day?
        var rect = coordinateGrid.rect(row0, col0, row1, col1, slotLayer);
        return renderOverlay(rect, slotLayer);
    }
    

    function renderSlotOverlay(overlayStart, overlayEnd) {
        for (var i=0; i<colCnt; i++) {
            var dayStart = cellToDate(0, i);
            var dayEnd = addDays(cloneDate(dayStart), 1);
            var stretchStart = new Date(Math.max(dayStart, overlayStart));
            var stretchEnd = new Date(Math.min(dayEnd, overlayEnd));
            if (stretchStart < stretchEnd) {
                var rect = coordinateGrid.rect(0, i, 0, i, slotContainer); // only use it for horizontal coords
                var top = timePosition(dayStart, stretchStart);
                var bottom = timePosition(dayStart, stretchEnd);
                rect.top = top;
                rect.height = bottom - top;
                slotBind(
                    renderOverlay(rect, slotContainer)
                );
            }
        }
    }
    
    
    
    /* Coordinate Utilities
    -----------------------------------------------------------------------------*/
    
    
    coordinateGrid = new CoordinateGrid(function(rows, cols) {
        var e, n, p;
        dayHeadCells.each(function(i, _e) {
            e = $(_e);
            n = e.offset().left;
            if (i) {
                p[1] = n;
            }
            p = [n];
            cols[i] = p;
        });
        p[1] = n + e.outerWidth();
        if (opt('allDaySlot')) {
            e = allDayRow;
            n = e.offset().top;
            rows[0] = [n, n+e.outerHeight()];
        }
        var slotTableTop = slotContainer.offset().top;
        var slotScrollerTop = slotScroller.offset().top;
        var slotScrollerBottom = slotScrollerTop + slotScroller.outerHeight();
        function constrain(n) {
            return Math.max(slotScrollerTop, Math.min(slotScrollerBottom, n));
        }
        for (var i=0; i<slotCnt*snapRatio; i++) { // adapt slot count to increased/decreased selection slot count
            rows.push([
                constrain(slotTableTop + snapHeight*i),
                constrain(slotTableTop + snapHeight*(i+1))
            ]);
        }
    });
    
    
    hoverListener = new HoverListener(coordinateGrid);
    
    colPositions = new HorizontalPositionCache(function(col) {
        return dayBodyCellInners.eq(col);
    });
    
    colContentPositions = new HorizontalPositionCache(function(col) {
        return dayBodyCellContentInners.eq(col);
    });
    
    
    function colLeft(col) {
        return colPositions.left(col);
    }


    function colContentLeft(col) {
        return colContentPositions.left(col);
    }


    function colRight(col) {
        return colPositions.right(col);
    }
    
    
    function colContentRight(col) {
        return colContentPositions.right(col);
    }


    function getIsCellAllDay(cell) {
        return opt('allDaySlot') && !cell.row;
    }


    function realCellToDate(cell) { // ugh "real" ... but blame it on our abuse of the "cell" system
        var d = cellToDate(0, cell.col);
        var slotIndex = cell.row;
        if (opt('allDaySlot')) {
            slotIndex--;
        }
        if (slotIndex >= 0) {
            addMinutes(d, minMinute + slotIndex * snapMinutes);
        }
        return d;
    }
    
    
    // get the Y coordinate of the given time on the given day (both Date objects)
    function timePosition(day, time) { // both date objects. day holds 00:00 of current day
        day = cloneDate(day, true);
        if (time < addMinutes(cloneDate(day), minMinute)) {
            return 0;
        }
        if (time >= addMinutes(cloneDate(day), maxMinute)) {
            return slotTable.height();
        }
        var slotMinutes = opt('slotMinutes'),
            minutes = time.getHours()*60 + time.getMinutes() - minMinute,
            slotI = Math.floor(minutes / slotMinutes),
            slotTop = slotTopCache[slotI];
        if (slotTop === undefined) {
            slotTop = slotTopCache[slotI] =
                slotTable.find('tr').eq(slotI).find('td div')[0].offsetTop;
                // .eq() is faster than ":eq()" selector
                // [0].offsetTop is faster than .position().top (do we really need this optimization?)
                // a better optimization would be to cache all these divs
        }
        return Math.max(0, Math.round(
            slotTop - 1 + slotHeight * ((minutes % slotMinutes) / slotMinutes)
        ));
    }
    
    
    function getAllDayRow(index) {
        return allDayRow;
    }
    
    
    function defaultEventEnd(event) {
        var start = cloneDate(event.start);
        if (event.allDay) {
            return start;
        }
        return addMinutes(start, opt('defaultEventMinutes'));
    }
    
    
    
    /* Selection
    ---------------------------------------------------------------------------------*/
    
    
    function defaultSelectionEnd(startDate, allDay) {
        if (allDay) {
            return cloneDate(startDate);
        }
        return addMinutes(cloneDate(startDate), opt('slotMinutes'));
    }
    
    
    function renderSelection(startDate, endDate, allDay) { // only for all-day
        if (allDay) {
            if (opt('allDaySlot')) {
                renderDayOverlay(startDate, addDays(cloneDate(endDate), 1), true);
            }
        }else{
            renderSlotSelection(startDate, endDate);
        }
    }
    
    
    function renderSlotSelection(startDate, endDate) {
        var helperOption = opt('selectHelper');
        coordinateGrid.build();
        if (helperOption) {
            var col = dateToCell(startDate).col;
            if (col >= 0 && col < colCnt) { // only works when times are on same day
                var rect = coordinateGrid.rect(0, col, 0, col, slotContainer); // only for horizontal coords
                var top = timePosition(startDate, startDate);
                var bottom = timePosition(startDate, endDate);
                if (bottom > top) { // protect against selections that are entirely before or after visible range
                    rect.top = top;
                    rect.height = bottom - top;
                    rect.left += 2;
                    rect.width -= 5;
                    if ($.isFunction(helperOption)) {
                        var helperRes = helperOption(startDate, endDate);
                        if (helperRes) {
                            rect.position = 'absolute';
                            selectionHelper = $(helperRes)
                                .css(rect)
                                .appendTo(slotContainer);
                        }
                    }else{
                        rect.isStart = true; // conside rect a "seg" now
                        rect.isEnd = true;   //
                        selectionHelper = $(slotSegHtml(
                            {
                                title: '',
                                start: startDate,
                                end: endDate,
                                className: ['fc-select-helper'],
                                editable: false
                            },
                            rect
                        ));
                        selectionHelper.css('opacity', opt('dragOpacity'));
                    }
                    if (selectionHelper) {
                        slotBind(selectionHelper);
                        slotContainer.append(selectionHelper);
                        setOuterWidth(selectionHelper, rect.width, true); // needs to be after appended
                        setOuterHeight(selectionHelper, rect.height, true);
                    }
                }
            }
        }else{
            renderSlotOverlay(startDate, endDate);
        }
    }
    
    
    function clearSelection() {
        clearOverlays();
        if (selectionHelper) {
            selectionHelper.remove();
            selectionHelper = null;
        }
    }
    
    
    function slotSelectionMousedown(ev) {
        if (ev.which == 1 && opt('selectable')) { // ev.which==1 means left mouse button
            unselect(ev);
            var dates;
            hoverListener.start(function(cell, origCell) {
                clearSelection();
                if (cell && cell.col == origCell.col && !getIsCellAllDay(cell)) {
                    var d1 = realCellToDate(origCell);
                    var d2 = realCellToDate(cell);
                    dates = [
                        d1,
                        addMinutes(cloneDate(d1), snapMinutes), // calculate minutes depending on selection slot minutes 
                        d2,
                        addMinutes(cloneDate(d2), snapMinutes)
                    ].sort(dateCompare);
                    renderSlotSelection(dates[0], dates[3]);
                }else{
                    dates = null;
                }
            }, ev);
            $(document).one('mouseup', function(ev) {
                hoverListener.stop();
                if (dates) {
                    if (+dates[0] == +dates[1]) {
                        reportDayClick(dates[0], false, ev);
                    }
                    reportSelection(dates[0], dates[3], false, ev);
                }
            });
        }
    }


    function reportDayClick(date, allDay, ev) {
        trigger('dayClick', dayBodyCells[dateToCell(date).col], date, allDay, ev);
    }
    
    
    
    /* External Dragging
    --------------------------------------------------------------------------------*/
    
    
    function dragStart(_dragElement, ev, ui) {
        hoverListener.start(function(cell) {
            clearOverlays();
            if (cell) {
                if (getIsCellAllDay(cell)) {
                    renderCellOverlay(cell.row, cell.col, cell.row, cell.col);
                }else{
                    var d1 = realCellToDate(cell);
                    var d2 = addMinutes(cloneDate(d1), opt('defaultEventMinutes'));
                    renderSlotOverlay(d1, d2);
                }
            }
        }, ev);
    }
    
    
    function dragStop(_dragElement, ev, ui) {
        var cell = hoverListener.stop();
        clearOverlays();
        if (cell) {
            trigger('drop', _dragElement, realCellToDate(cell), getIsCellAllDay(cell), ev, ui);
        }
    }
    

}



function AgendaEventRenderer() {
    var t = this;
    
    
    // exports
    t.renderEvents = renderEvents;
    t.clearEvents = clearEvents;
    t.slotSegHtml = slotSegHtml;
    
    
    // imports
    DayEventRenderer.call(t);
    var opt = t.opt;
    var trigger = t.trigger;
    var isEventDraggable = t.isEventDraggable;
    var isEventResizable = t.isEventResizable;
    var eventEnd = t.eventEnd;
    var eventElementHandlers = t.eventElementHandlers;
    var setHeight = t.setHeight;
    var getDaySegmentContainer = t.getDaySegmentContainer;
    var getSlotSegmentContainer = t.getSlotSegmentContainer;
    var getHoverListener = t.getHoverListener;
    var getMaxMinute = t.getMaxMinute;
    var getMinMinute = t.getMinMinute;
    var timePosition = t.timePosition;
    var getIsCellAllDay = t.getIsCellAllDay;
    var colContentLeft = t.colContentLeft;
    var colContentRight = t.colContentRight;
    var cellToDate = t.cellToDate;
    var getColCnt = t.getColCnt;
    var getColWidth = t.getColWidth;
    var getSnapHeight = t.getSnapHeight;
    var getSnapMinutes = t.getSnapMinutes;
    var getSlotContainer = t.getSlotContainer;
    var reportEventElement = t.reportEventElement;
    var showEvents = t.showEvents;
    var hideEvents = t.hideEvents;
    var eventDrop = t.eventDrop;
    var eventResize = t.eventResize;
    var renderDayOverlay = t.renderDayOverlay;
    var clearOverlays = t.clearOverlays;
    var renderDayEvents = t.renderDayEvents;
    var calendar = t.calendar;
    var formatDate = calendar.formatDate;
    var formatDates = calendar.formatDates;


    // overrides
    t.draggableDayEvent = draggableDayEvent;

    
    
    /* Rendering
    ----------------------------------------------------------------------------*/
    

    function renderEvents(events, modifiedEventId) {
        var i, len=events.length,
            dayEvents=[],
            slotEvents=[];
        for (i=0; i<len; i++) {
            if (events[i].allDay) {
                dayEvents.push(events[i]);
            }else{
                slotEvents.push(events[i]);
            }
        }

        if (opt('allDaySlot')) {
            renderDayEvents(dayEvents, modifiedEventId);
            setHeight(); // no params means set to viewHeight
        }

        renderSlotSegs(compileSlotSegs(slotEvents), modifiedEventId);
    }
    
    
    function clearEvents() {
        getDaySegmentContainer().empty();
        getSlotSegmentContainer().empty();
    }

    
    function compileSlotSegs(events) {
        var colCnt = getColCnt(),
            minMinute = getMinMinute(),
            maxMinute = getMaxMinute(),
            d,
            visEventEnds = $.map(events, slotEventEnd),
            i,
            j, seg,
            colSegs,
            segs = [];

        for (i=0; i<colCnt; i++) {

            d = cellToDate(0, i);
            addMinutes(d, minMinute);

            colSegs = sliceSegs(
                events,
                visEventEnds,
                d,
                addMinutes(cloneDate(d), maxMinute-minMinute)
            );

            colSegs = placeSlotSegs(colSegs); // returns a new order

            for (j=0; j<colSegs.length; j++) {
                seg = colSegs[j];
                seg.col = i;
                segs.push(seg);
            }
        }

        return segs;
    }


    function sliceSegs(events, visEventEnds, start, end) {
        var segs = [],
            i, len=events.length, event,
            eventStart, eventEnd,
            segStart, segEnd,
            isStart, isEnd;
        for (i=0; i<len; i++) {
            event = events[i];
            eventStart = event.start;
            eventEnd = visEventEnds[i];
            if (eventEnd > start && eventStart < end) {
                if (eventStart < start) {
                    segStart = cloneDate(start);
                    isStart = false;
                }else{
                    segStart = eventStart;
                    isStart = true;
                }
                if (eventEnd > end) {
                    segEnd = cloneDate(end);
                    isEnd = false;
                }else{
                    segEnd = eventEnd;
                    isEnd = true;
                }
                segs.push({
                    event: event,
                    start: segStart,
                    end: segEnd,
                    isStart: isStart,
                    isEnd: isEnd
                });
            }
        }
        return segs.sort(compareSlotSegs);
    }


    function slotEventEnd(event) {
        if (event.end) {
            return cloneDate(event.end);
        }else{
            return addMinutes(cloneDate(event.start), opt('defaultEventMinutes'));
        }
    }
    
    
    // renders events in the 'time slots' at the bottom
    // TODO: when we refactor this, when user returns `false` eventRender, don't have empty space
    // TODO: refactor will include using pixels to detect collisions instead of dates (handy for seg cmp)
    
    function renderSlotSegs(segs, modifiedEventId) {
    
        var i, segCnt=segs.length, seg,
            event,
            top,
            bottom,
            columnLeft,
            columnRight,
            columnWidth,
            width,
            left,
            right,
            html = '',
            eventElements,
            eventElement,
            triggerRes,
            titleElement,
            height,
            slotSegmentContainer = getSlotSegmentContainer(),
            isRTL = opt('isRTL');
            
        // calculate position/dimensions, create html
        for (i=0; i<segCnt; i++) {
            seg = segs[i];
            event = seg.event;
            top = timePosition(seg.start, seg.start);
            bottom = timePosition(seg.start, seg.end);
            columnLeft = colContentLeft(seg.col);
            columnRight = colContentRight(seg.col);
            columnWidth = columnRight - columnLeft;

            // shave off space on right near scrollbars (2.5%)
            // TODO: move this to CSS somehow
            columnRight -= columnWidth * .025;
            columnWidth = columnRight - columnLeft;

            width = columnWidth * (seg.forwardCoord - seg.backwardCoord);

            if (opt('slotEventOverlap')) {
                // double the width while making sure resize handle is visible
                // (assumed to be 20px wide)
                width = Math.max(
                    (width - (20/2)) * 2,
                    width // narrow columns will want to make the segment smaller than
                        // the natural width. don't allow it
                );
            }

            if (isRTL) {
                right = columnRight - seg.backwardCoord * columnWidth;
                left = right - width;
            }
            else {
                left = columnLeft + seg.backwardCoord * columnWidth;
                right = left + width;
            }

            // make sure horizontal coordinates are in bounds
            left = Math.max(left, columnLeft);
            right = Math.min(right, columnRight);
            width = right - left;

            seg.top = top;
            seg.left = left;
            seg.outerWidth = width;
            seg.outerHeight = bottom - top;
            html += slotSegHtml(event, seg);
        }

        slotSegmentContainer[0].innerHTML = html; // faster than html()
        eventElements = slotSegmentContainer.children();
        
        // retrieve elements, run through eventRender callback, bind event handlers
        for (i=0; i<segCnt; i++) {
            seg = segs[i];
            event = seg.event;
            eventElement = $(eventElements[i]); // faster than eq()
            triggerRes = trigger('eventRender', event, event, eventElement);
            if (triggerRes === false) {
                eventElement.remove();
            }else{
                if (triggerRes && triggerRes !== true) {
                    eventElement.remove();
                    eventElement = $(triggerRes)
                        .css({
                            position: 'absolute',
                            top: seg.top,
                            left: seg.left
                        })
                        .appendTo(slotSegmentContainer);
                }
                seg.element = eventElement;
                if (event._id === modifiedEventId) {
                    bindSlotSeg(event, eventElement, seg);
                }else{
                    eventElement[0]._fci = i; // for lazySegBind
                }
                reportEventElement(event, eventElement);
            }
        }
        
        lazySegBind(slotSegmentContainer, segs, bindSlotSeg);
        
        // record event sides and title positions
        for (i=0; i<segCnt; i++) {
            seg = segs[i];
            if (eventElement = seg.element) {
                seg.vsides = vsides(eventElement, true);
                seg.hsides = hsides(eventElement, true);
                titleElement = eventElement.find('.fc-event-title');
                if (titleElement.length) {
                    seg.contentTop = titleElement[0].offsetTop;
                }
            }
        }
        
        // set all positions/dimensions at once
        for (i=0; i<segCnt; i++) {
            seg = segs[i];
            if (eventElement = seg.element) {
                eventElement[0].style.width = Math.max(0, seg.outerWidth - seg.hsides) + 'px';
                height = Math.max(0, seg.outerHeight - seg.vsides);
                eventElement[0].style.height = height + 'px';
                event = seg.event;
                if (seg.contentTop !== undefined && height - seg.contentTop < 10) {
                    // not enough room for title, put it in the time (TODO: maybe make both display:inline instead)
                    eventElement.find('div.fc-event-time')
                        .text(formatDate(event.start, opt('timeFormat')) + ' - ' + event.title);
                    eventElement.find('div.fc-event-title')
                        .remove();
                }
                trigger('eventAfterRender', event, event, eventElement);
            }
        }
                    
    }
    
    
    function slotSegHtml(event, seg) {
        var html = "<";
        var url = event.url;
        var skinCss = getSkinCss(event, opt);
        var classes = ['fc-event', 'fc-event-vert'];
        if (isEventDraggable(event)) {
            classes.push('fc-event-draggable');
        }
        if (seg.isStart) {
            classes.push('fc-event-start');
        }
        if (seg.isEnd) {
            classes.push('fc-event-end');
        }
        classes = classes.concat(event.className);
        if (event.source) {
            classes = classes.concat(event.source.className || []);
        }
        if (url) {
            html += "a href='" + htmlEscape(event.url) + "'";
        }else{
            html += "div";
        }
        html +=
            " class='" + classes.join(' ') + "'" +
            " style=" +
                "'" +
                "position:absolute;" +
                "top:" + seg.top + "px;" +
                "left:" + seg.left + "px;" +
                skinCss +
                "'" +
            ">" +
            "<div class='fc-event-inner'>" +
            "<div class='fc-event-time'>" +
            htmlEscape(formatDates(event.start, event.end, opt('timeFormat'))) +
            "</div>" +
            "<div class='fc-event-title'>" +
            htmlEscape(event.title || '') +
            "</div>" +
            "</div>" +
            "<div class='fc-event-bg'></div>";
        if (seg.isEnd && isEventResizable(event)) {
            html +=
                "<div class='ui-resizable-handle ui-resizable-s'>=</div>";
        }
        html +=
            "</" + (url ? "a" : "div") + ">";
        return html;
    }
    
    
    function bindSlotSeg(event, eventElement, seg) {
        var timeElement = eventElement.find('div.fc-event-time');
        if (isEventDraggable(event)) {
            draggableSlotEvent(event, eventElement, timeElement);
        }
        if (seg.isEnd && isEventResizable(event)) {
            resizableSlotEvent(event, eventElement, timeElement);
        }
        eventElementHandlers(event, eventElement);
    }
    
    
    
    /* Dragging
    -----------------------------------------------------------------------------------*/
    
    
    // when event starts out FULL-DAY
    // overrides DayEventRenderer's version because it needs to account for dragging elements
    // to and from the slot area.
    
    function draggableDayEvent(event, eventElement, seg) {
        var isStart = seg.isStart;
        var origWidth;
        var revert;
        var allDay = true;
        var dayDelta;
        var hoverListener = getHoverListener();
        var colWidth = getColWidth();
        var snapHeight = getSnapHeight();
        var snapMinutes = getSnapMinutes();
        var minMinute = getMinMinute();
        eventElement.draggable({
            opacity: opt('dragOpacity', 'month'), // use whatever the month view was using
            revertDuration: opt('dragRevertDuration'),
            start: function(ev, ui) {
                trigger('eventDragStart', eventElement, event, ev, ui);
                hideEvents(event, eventElement);
                origWidth = eventElement.width();
                hoverListener.start(function(cell, origCell) {
                    clearOverlays();
                    if (cell) {
                        revert = false;
                        var origDate = cellToDate(0, origCell.col);
                        var date = cellToDate(0, cell.col);
                        dayDelta = dayDiff(date, origDate);
                        if (!cell.row) {
                            // on full-days
                            renderDayOverlay(
                                addDays(cloneDate(event.start), dayDelta),
                                addDays(exclEndDay(event), dayDelta)
                            );
                            resetElement();
                        }else{
                            // mouse is over bottom slots
                            if (isStart) {
                                if (allDay) {
                                    // convert event to temporary slot-event
                                    eventElement.width(colWidth - 10); // don't use entire width
                                    setOuterHeight(
                                        eventElement,
                                        snapHeight * Math.round(
                                            (event.end ? ((event.end - event.start) / MINUTE_MS) : opt('defaultEventMinutes')) /
                                                snapMinutes
                                        )
                                    );
                                    eventElement.draggable('option', 'grid', [colWidth, 1]);
                                    allDay = false;
                                }
                            }else{
                                revert = true;
                            }
                        }
                        revert = revert || (allDay && !dayDelta);
                    }else{
                        resetElement();
                        revert = true;
                    }
                    eventElement.draggable('option', 'revert', revert);
                }, ev, 'drag');
            },
            stop: function(ev, ui) {
                hoverListener.stop();
                clearOverlays();
                trigger('eventDragStop', eventElement, event, ev, ui);
                if (revert) {
                    // hasn't moved or is out of bounds (draggable has already reverted)
                    resetElement();
                    eventElement.css('filter', ''); // clear IE opacity side-effects
                    showEvents(event, eventElement);
                }else{
                    // changed!
                    var minuteDelta = 0;
                    if (!allDay) {
                        minuteDelta = Math.round((eventElement.offset().top - getSlotContainer().offset().top) / snapHeight)
                            * snapMinutes
                            + minMinute
                            - (event.start.getHours() * 60 + event.start.getMinutes());
                    }
                    eventDrop(this, event, dayDelta, minuteDelta, allDay, ev, ui);
                }
            }
        });
        function resetElement() {
            if (!allDay) {
                eventElement
                    .width(origWidth)
                    .height('')
                    .draggable('option', 'grid', null);
                allDay = true;
            }
        }
    }
    
    
    // when event starts out IN TIMESLOTS
    
    function draggableSlotEvent(event, eventElement, timeElement) {
        var coordinateGrid = t.getCoordinateGrid();
        var colCnt = getColCnt();
        var colWidth = getColWidth();
        var snapHeight = getSnapHeight();
        var snapMinutes = getSnapMinutes();

        // states
        var origPosition; // original position of the element, not the mouse
        var origCell;
        var isInBounds, prevIsInBounds;
        var isAllDay, prevIsAllDay;
        var colDelta, prevColDelta;
        var dayDelta; // derived from colDelta
        var minuteDelta, prevMinuteDelta;

        eventElement.draggable({
            scroll: false,
            grid: [ colWidth, snapHeight ],
            axis: colCnt==1 ? 'y' : false,
            opacity: opt('dragOpacity'),
            revertDuration: opt('dragRevertDuration'),
            start: function(ev, ui) {

                trigger('eventDragStart', eventElement, event, ev, ui);
                hideEvents(event, eventElement);

                coordinateGrid.build();

                // initialize states
                origPosition = eventElement.position();
                origCell = coordinateGrid.cell(ev.pageX, ev.pageY);
                isInBounds = prevIsInBounds = true;
                isAllDay = prevIsAllDay = getIsCellAllDay(origCell);
                colDelta = prevColDelta = 0;
                dayDelta = 0;
                minuteDelta = prevMinuteDelta = 0;

            },
            drag: function(ev, ui) {

                // NOTE: this `cell` value is only useful for determining in-bounds and all-day.
                // Bad for anything else due to the discrepancy between the mouse position and the
                // element position while snapping. (problem revealed in PR #55)
                //
                // PS- the problem exists for draggableDayEvent() when dragging an all-day event to a slot event.
                // We should overhaul the dragging system and stop relying on jQuery UI.
                var cell = coordinateGrid.cell(ev.pageX, ev.pageY);

                // update states
                isInBounds = !!cell;
                if (isInBounds) {
                    isAllDay = getIsCellAllDay(cell);

                    // calculate column delta
                    colDelta = Math.round((ui.position.left - origPosition.left) / colWidth);
                    if (colDelta != prevColDelta) {
                        // calculate the day delta based off of the original clicked column and the column delta
                        var origDate = cellToDate(0, origCell.col);
                        var col = origCell.col + colDelta;
                        col = Math.max(0, col);
                        col = Math.min(colCnt-1, col);
                        var date = cellToDate(0, col);
                        dayDelta = dayDiff(date, origDate);
                    }

                    // calculate minute delta (only if over slots)
                    if (!isAllDay) {
                        minuteDelta = Math.round((ui.position.top - origPosition.top) / snapHeight) * snapMinutes;
                    }
                }

                // any state changes?
                if (
                    isInBounds != prevIsInBounds ||
                    isAllDay != prevIsAllDay ||
                    colDelta != prevColDelta ||
                    minuteDelta != prevMinuteDelta
                ) {

                    updateUI();

                    // update previous states for next time
                    prevIsInBounds = isInBounds;
                    prevIsAllDay = isAllDay;
                    prevColDelta = colDelta;
                    prevMinuteDelta = minuteDelta;
                }

                // if out-of-bounds, revert when done, and vice versa.
                eventElement.draggable('option', 'revert', !isInBounds);

            },
            stop: function(ev, ui) {

                clearOverlays();
                trigger('eventDragStop', eventElement, event, ev, ui);

                if (isInBounds && (isAllDay || dayDelta || minuteDelta)) { // changed!
                    eventDrop(this, event, dayDelta, isAllDay ? 0 : minuteDelta, isAllDay, ev, ui);
                }
                else { // either no change or out-of-bounds (draggable has already reverted)

                    // reset states for next time, and for updateUI()
                    isInBounds = true;
                    isAllDay = false;
                    colDelta = 0;
                    dayDelta = 0;
                    minuteDelta = 0;

                    updateUI();
                    eventElement.css('filter', ''); // clear IE opacity side-effects

                    // sometimes fast drags make event revert to wrong position, so reset.
                    // also, if we dragged the element out of the area because of snapping,
                    // but the *mouse* is still in bounds, we need to reset the position.
                    eventElement.css(origPosition);

                    showEvents(event, eventElement);
                }
            }
        });

        function updateUI() {
            clearOverlays();
            if (isInBounds) {
                if (isAllDay) {
                    timeElement.hide();
                    eventElement.draggable('option', 'grid', null); // disable grid snapping
                    renderDayOverlay(
                        addDays(cloneDate(event.start), dayDelta),
                        addDays(exclEndDay(event), dayDelta)
                    );
                }
                else {
                    updateTimeText(minuteDelta);
                    timeElement.css('display', ''); // show() was causing display=inline
                    eventElement.draggable('option', 'grid', [colWidth, snapHeight]); // re-enable grid snapping
                }
            }
        }

        function updateTimeText(minuteDelta) {
            var newStart = addMinutes(cloneDate(event.start), minuteDelta);
            var newEnd;
            if (event.end) {
                newEnd = addMinutes(cloneDate(event.end), minuteDelta);
            }
            timeElement.text(formatDates(newStart, newEnd, opt('timeFormat')));
        }

    }
    
    
    
    /* Resizing
    --------------------------------------------------------------------------------------*/
    
    
    function resizableSlotEvent(event, eventElement, timeElement) {
        var snapDelta, prevSnapDelta;
        var snapHeight = getSnapHeight();
        var snapMinutes = getSnapMinutes();
        eventElement.resizable({
            handles: {
                s: '.ui-resizable-handle'
            },
            grid: snapHeight,
            start: function(ev, ui) {
                snapDelta = prevSnapDelta = 0;
                hideEvents(event, eventElement);
                trigger('eventResizeStart', this, event, ev, ui);
            },
            resize: function(ev, ui) {
                // don't rely on ui.size.height, doesn't take grid into account
                snapDelta = Math.round((Math.max(snapHeight, eventElement.height()) - ui.originalSize.height) / snapHeight);
                if (snapDelta != prevSnapDelta) {
                    timeElement.text(
                        formatDates(
                            event.start,
                            (!snapDelta && !event.end) ? null : // no change, so don't display time range
                                addMinutes(eventEnd(event), snapMinutes*snapDelta),
                            opt('timeFormat')
                        )
                    );
                    prevSnapDelta = snapDelta;
                }
            },
            stop: function(ev, ui) {
                trigger('eventResizeStop', this, event, ev, ui);
                if (snapDelta) {
                    eventResize(this, event, 0, snapMinutes*snapDelta, ev, ui);
                }else{
                    showEvents(event, eventElement);
                    // BUG: if event was really short, need to put title back in span
                }
            }
        });
    }
    

}



/* Agenda Event Segment Utilities
-----------------------------------------------------------------------------*/


// Sets the seg.backwardCoord and seg.forwardCoord on each segment and returns a new
// list in the order they should be placed into the DOM (an implicit z-index).
function placeSlotSegs(segs) {
    var levels = buildSlotSegLevels(segs);
    var level0 = levels[0];
    var i;

    computeForwardSlotSegs(levels);

    if (level0) {

        for (i=0; i<level0.length; i++) {
            computeSlotSegPressures(level0[i]);
        }

        for (i=0; i<level0.length; i++) {
            computeSlotSegCoords(level0[i], 0, 0);
        }
    }

    return flattenSlotSegLevels(levels);
}


// Builds an array of segments "levels". The first level will be the leftmost tier of segments
// if the calendar is left-to-right, or the rightmost if the calendar is right-to-left.
function buildSlotSegLevels(segs) {
    var levels = [];
    var i, seg;
    var j;

    for (i=0; i<segs.length; i++) {
        seg = segs[i];

        // go through all the levels and stop on the first level where there are no collisions
        for (j=0; j<levels.length; j++) {
            if (!computeSlotSegCollisions(seg, levels[j]).length) {
                break;
            }
        }

        (levels[j] || (levels[j] = [])).push(seg);
    }

    return levels;
}


// For every segment, figure out the other segments that are in subsequent
// levels that also occupy the same vertical space. Accumulate in seg.forwardSegs
function computeForwardSlotSegs(levels) {
    var i, level;
    var j, seg;
    var k;

    for (i=0; i<levels.length; i++) {
        level = levels[i];

        for (j=0; j<level.length; j++) {
            seg = level[j];

            seg.forwardSegs = [];
            for (k=i+1; k<levels.length; k++) {
                computeSlotSegCollisions(seg, levels[k], seg.forwardSegs);
            }
        }
    }
}


// Figure out which path forward (via seg.forwardSegs) results in the longest path until
// the furthest edge is reached. The number of segments in this path will be seg.forwardPressure
function computeSlotSegPressures(seg) {
    var forwardSegs = seg.forwardSegs;
    var forwardPressure = 0;
    var i, forwardSeg;

    if (seg.forwardPressure === undefined) { // not already computed

        for (i=0; i<forwardSegs.length; i++) {
            forwardSeg = forwardSegs[i];

            // figure out the child's maximum forward path
            computeSlotSegPressures(forwardSeg);

            // either use the existing maximum, or use the child's forward pressure
            // plus one (for the forwardSeg itself)
            forwardPressure = Math.max(
                forwardPressure,
                1 + forwardSeg.forwardPressure
            );
        }

        seg.forwardPressure = forwardPressure;
    }
}


// Calculate seg.forwardCoord and seg.backwardCoord for the segment, where both values range
// from 0 to 1. If the calendar is left-to-right, the seg.backwardCoord maps to "left" and
// seg.forwardCoord maps to "right" (via percentage). Vice-versa if the calendar is right-to-left.
//
// The segment might be part of a "series", which means consecutive segments with the same pressure
// who's width is unknown until an edge has been hit. `seriesBackwardPressure` is the number of
// segments behind this one in the current series, and `seriesBackwardCoord` is the starting
// coordinate of the first segment in the series.
function computeSlotSegCoords(seg, seriesBackwardPressure, seriesBackwardCoord) {
    var forwardSegs = seg.forwardSegs;
    var i;

    if (seg.forwardCoord === undefined) { // not already computed

        if (!forwardSegs.length) {

            // if there are no forward segments, this segment should butt up against the edge
            seg.forwardCoord = 1;
        }
        else {

            // sort highest pressure first
            forwardSegs.sort(compareForwardSlotSegs);

            // this segment's forwardCoord will be calculated from the backwardCoord of the
            // highest-pressure forward segment.
            computeSlotSegCoords(forwardSegs[0], seriesBackwardPressure + 1, seriesBackwardCoord);
            seg.forwardCoord = forwardSegs[0].backwardCoord;
        }

        // calculate the backwardCoord from the forwardCoord. consider the series
        seg.backwardCoord = seg.forwardCoord -
            (seg.forwardCoord - seriesBackwardCoord) / // available width for series
            (seriesBackwardPressure + 1); // # of segments in the series

        // use this segment's coordinates to computed the coordinates of the less-pressurized
        // forward segments
        for (i=0; i<forwardSegs.length; i++) {
            computeSlotSegCoords(forwardSegs[i], 0, seg.forwardCoord);
        }
    }
}


// Outputs a flat array of segments, from lowest to highest level
function flattenSlotSegLevels(levels) {
    var segs = [];
    var i, level;
    var j;

    for (i=0; i<levels.length; i++) {
        level = levels[i];

        for (j=0; j<level.length; j++) {
            segs.push(level[j]);
        }
    }

    return segs;
}


// Find all the segments in `otherSegs` that vertically collide with `seg`.
// Append into an optionally-supplied `results` array and return.
function computeSlotSegCollisions(seg, otherSegs, results) {
    results = results || [];

    for (var i=0; i<otherSegs.length; i++) {
        if (isSlotSegCollision(seg, otherSegs[i])) {
            results.push(otherSegs[i]);
        }
    }

    return results;
}


// Do these segments occupy the same vertical space?
function isSlotSegCollision(seg1, seg2) {
    return seg1.end > seg2.start && seg1.start < seg2.end;
}


// A cmp function for determining which forward segment to rely on more when computing coordinates.
function compareForwardSlotSegs(seg1, seg2) {
    // put higher-pressure first
    return seg2.forwardPressure - seg1.forwardPressure ||
        // put segments that are closer to initial edge first (and favor ones with no coords yet)
        (seg1.backwardCoord || 0) - (seg2.backwardCoord || 0) ||
        // do normal sorting...
        compareSlotSegs(seg1, seg2);
}

// customized by V.Kotovich
// 10.12.2015
// reason: sort booking slots alphabetically
// A cmp function for determining which segment should be closer to the initial edge
// (the left edge on a left-to-right calendar).
function compareSlotSegs(seg1, seg2) {
    return seg1.start - seg2.start || // earlier start time goes first
        // (seg2.end - seg2.start) - (seg1.end - seg1.start) || // tie? longer-duration goes first
        (seg1.event.title || '').localeCompare(seg2.event.title); // tie? alphabetically by title
}





function View(element, calendar, viewName) {
    var t = this;
    
    
    // exports
    t.element = element;
    t.calendar = calendar;
    t.name = viewName;
    t.opt = opt;
    t.trigger = trigger;
    t.isEventDraggable = isEventDraggable;
    t.isEventResizable = isEventResizable;
    t.setEventData = setEventData;
    t.clearEventData = clearEventData;
    t.eventEnd = eventEnd;
    t.reportEventElement = reportEventElement;
    t.triggerEventDestroy = triggerEventDestroy;
    t.eventElementHandlers = eventElementHandlers;
    t.showEvents = showEvents;
    t.hideEvents = hideEvents;
    t.eventDrop = eventDrop;
    t.eventResize = eventResize;
    // t.title
    // t.start, t.end
    // t.visStart, t.visEnd
    
    
    // imports
    var defaultEventEnd = t.defaultEventEnd;
    var normalizeEvent = calendar.normalizeEvent; // in EventManager
    var reportEventChange = calendar.reportEventChange;
    
    
    // locals
    var eventsByID = {}; // eventID mapped to array of events (there can be multiple b/c of repeating events)
    var eventElementsByID = {}; // eventID mapped to array of jQuery elements
    var eventElementCouples = []; // array of objects, { event, element } // TODO: unify with segment system
    var options = calendar.options;
    
    
    
    function opt(name, viewNameOverride) {
        var v = options[name];
        if ($.isPlainObject(v)) {
            return smartProperty(v, viewNameOverride || viewName);
        }
        return v;
    }

    
    function trigger(name, thisObj) {
        return calendar.trigger.apply(
            calendar,
            [name, thisObj || t].concat(Array.prototype.slice.call(arguments, 2), [t])
        );
    }
    


    /* Event Editable Boolean Calculations
    ------------------------------------------------------------------------------*/

    
    function isEventDraggable(event) {
        var source = event.source || {};
        return firstDefined(
                event.startEditable,
                source.startEditable,
                opt('eventStartEditable'),
                event.editable,
                source.editable,
                opt('editable')
            )
            && !opt('disableDragging'); // deprecated
    }
    
    
    function isEventResizable(event) { // but also need to make sure the seg.isEnd == true
        var source = event.source || {};
        return firstDefined(
                event.durationEditable,
                source.durationEditable,
                opt('eventDurationEditable'),
                event.editable,
                source.editable,
                opt('editable')
            )
            && !opt('disableResizing'); // deprecated
    }
    
    
    
    /* Event Data
    ------------------------------------------------------------------------------*/
    
    
    function setEventData(events) { // events are already normalized at this point
        eventsByID = {};
        var i, len=events.length, event;
        for (i=0; i<len; i++) {
            event = events[i];
            if (eventsByID[event._id]) {
                eventsByID[event._id].push(event);
            }else{
                eventsByID[event._id] = [event];
            }
        }
    }


    function clearEventData() {
        eventsByID = {};
        eventElementsByID = {};
        eventElementCouples = [];
    }
    
    
    // returns a Date object for an event's end
    function eventEnd(event) {
        return event.end ? cloneDate(event.end) : defaultEventEnd(event);
    }
    
    
    
    /* Event Elements
    ------------------------------------------------------------------------------*/
    
    
    // report when view creates an element for an event
    function reportEventElement(event, element) {
        eventElementCouples.push({ event: event, element: element });
        if (eventElementsByID[event._id]) {
            eventElementsByID[event._id].push(element);
        }else{
            eventElementsByID[event._id] = [element];
        }
    }


    function triggerEventDestroy() {
        $.each(eventElementCouples, function(i, couple) {
            t.trigger('eventDestroy', couple.event, couple.event, couple.element);
        });
    }
    
    
    // attaches eventClick, eventMouseover, eventMouseout
    function eventElementHandlers(event, eventElement) {
        eventElement
            .click(function(ev) {
                if (!eventElement.hasClass('ui-draggable-dragging') &&
                    !eventElement.hasClass('ui-resizable-resizing')) {
                        return trigger('eventClick', this, event, ev);
                    }
            })
            .hover(
                function(ev) {
                    trigger('eventMouseover', this, event, ev);
                },
                function(ev) {
                    trigger('eventMouseout', this, event, ev);
                }
            );
        // TODO: don't fire eventMouseover/eventMouseout *while* dragging is occuring (on subject element)
        // TODO: same for resizing
    }
    
    
    function showEvents(event, exceptElement) {
        eachEventElement(event, exceptElement, 'show');
    }
    
    
    function hideEvents(event, exceptElement) {
        eachEventElement(event, exceptElement, 'hide');
    }
    
    
    function eachEventElement(event, exceptElement, funcName) {
        // NOTE: there may be multiple events per ID (repeating events)
        // and multiple segments per event
        var elements = eventElementsByID[event._id],
            i, len = elements.length;
        for (i=0; i<len; i++) {
            if (!exceptElement || elements[i][0] != exceptElement[0]) {
                elements[i][funcName]();
            }
        }
    }
    
    
    
    /* Event Modification Reporting
    ---------------------------------------------------------------------------------*/
    
    
    function eventDrop(e, event, dayDelta, minuteDelta, allDay, ev, ui) {
        var oldAllDay = event.allDay;
        var eventId = event._id;
        moveEvents(eventsByID[eventId], dayDelta, minuteDelta, allDay);
        trigger(
            'eventDrop',
            e,
            event,
            dayDelta,
            minuteDelta,
            allDay,
            function() {
                // TODO: investigate cases where this inverse technique might not work
                moveEvents(eventsByID[eventId], -dayDelta, -minuteDelta, oldAllDay);
                reportEventChange(eventId);
            },
            ev,
            ui
        );
        reportEventChange(eventId);
    }
    
    
    function eventResize(e, event, dayDelta, minuteDelta, ev, ui) {
        var eventId = event._id;
        elongateEvents(eventsByID[eventId], dayDelta, minuteDelta);
        trigger(
            'eventResize',
            e,
            event,
            dayDelta,
            minuteDelta,
            function() {
                // TODO: investigate cases where this inverse technique might not work
                elongateEvents(eventsByID[eventId], -dayDelta, -minuteDelta);
                reportEventChange(eventId);
            },
            ev,
            ui
        );
        reportEventChange(eventId);
    }
    
    
    
    /* Event Modification Math
    ---------------------------------------------------------------------------------*/
    
    
    function moveEvents(events, dayDelta, minuteDelta, allDay) {
        minuteDelta = minuteDelta || 0;
        for (var e, len=events.length, i=0; i<len; i++) {
            e = events[i];
            if (allDay !== undefined) {
                e.allDay = allDay;
            }
            addMinutes(addDays(e.start, dayDelta, true), minuteDelta);
            if (e.end) {
                e.end = addMinutes(addDays(e.end, dayDelta, true), minuteDelta);
            }
            normalizeEvent(e, options);
        }
    }
    
    
    function elongateEvents(events, dayDelta, minuteDelta) {
        minuteDelta = minuteDelta || 0;
        for (var e, len=events.length, i=0; i<len; i++) {
            e = events[i];
            e.end = addMinutes(addDays(eventEnd(e), dayDelta, true), minuteDelta);
            normalizeEvent(e, options);
        }
    }



    // ====================================================================================================
    // Utilities for day "cells"
    // ====================================================================================================
    // The "basic" views are completely made up of day cells.
    // The "agenda" views have day cells at the top "all day" slot.
    // This was the obvious common place to put these utilities, but they should be abstracted out into
    // a more meaningful class (like DayEventRenderer).
    // ====================================================================================================


    // For determining how a given "cell" translates into a "date":
    //
    // 1. Convert the "cell" (row and column) into a "cell offset" (the # of the cell, cronologically from the first).
    //    Keep in mind that column indices are inverted with isRTL. This is taken into account.
    //
    // 2. Convert the "cell offset" to a "day offset" (the # of days since the first visible day in the view).
    //
    // 3. Convert the "day offset" into a "date" (a JavaScript Date object).
    //
    // The reverse transformation happens when transforming a date into a cell.


    // exports
    t.isHiddenDay = isHiddenDay;
    t.skipHiddenDays = skipHiddenDays;
    t.getCellsPerWeek = getCellsPerWeek;
    t.dateToCell = dateToCell;
    t.dateToDayOffset = dateToDayOffset;
    t.dayOffsetToCellOffset = dayOffsetToCellOffset;
    t.cellOffsetToCell = cellOffsetToCell;
    t.cellToDate = cellToDate;
    t.cellToCellOffset = cellToCellOffset;
    t.cellOffsetToDayOffset = cellOffsetToDayOffset;
    t.dayOffsetToDate = dayOffsetToDate;
    t.rangeToSegments = rangeToSegments;


    // internals
    var hiddenDays = opt('hiddenDays') || []; // array of day-of-week indices that are hidden
    var isHiddenDayHash = []; // is the day-of-week hidden? (hash with day-of-week-index -> bool)
    var cellsPerWeek;
    var dayToCellMap = []; // hash from dayIndex -> cellIndex, for one week
    var cellToDayMap = []; // hash from cellIndex -> dayIndex, for one week
    var isRTL = opt('isRTL');


    // initialize important internal variables
    (function() {

        if (opt('weekends') === false) {
            hiddenDays.push(0, 6); // 0=sunday, 6=saturday
        }

        // Loop through a hypothetical week and determine which
        // days-of-week are hidden. Record in both hashes (one is the reverse of the other).
        for (var dayIndex=0, cellIndex=0; dayIndex<7; dayIndex++) {
            dayToCellMap[dayIndex] = cellIndex;
            isHiddenDayHash[dayIndex] = $.inArray(dayIndex, hiddenDays) != -1;
            if (!isHiddenDayHash[dayIndex]) {
                cellToDayMap[cellIndex] = dayIndex;
                cellIndex++;
            }
        }

        cellsPerWeek = cellIndex;
        if (!cellsPerWeek) {
            throw 'invalid hiddenDays'; // all days were hidden? bad.
        }

    })();


    // Is the current day hidden?
    // `day` is a day-of-week index (0-6), or a Date object
    function isHiddenDay(day) {
        if (typeof day == 'object') {
            day = day.getDay();
        }
        return isHiddenDayHash[day];
    }


    function getCellsPerWeek() {
        return cellsPerWeek;
    }


    // Keep incrementing the current day until it is no longer a hidden day.
    // If the initial value of `date` is not a hidden day, don't do anything.
    // Pass `isExclusive` as `true` if you are dealing with an end date.
    // `inc` defaults to `1` (increment one day forward each time)
    function skipHiddenDays(date, inc, isExclusive) {
        inc = inc || 1;
        while (
            isHiddenDayHash[ ( date.getDay() + (isExclusive ? inc : 0) + 7 ) % 7 ]
        ) {
            addDays(date, inc);
        }
    }


    //
    // TRANSFORMATIONS: cell -> cell offset -> day offset -> date
    //

    // cell -> date (combines all transformations)
    // Possible arguments:
    // - row, col
    // - { row:#, col: # }
    function cellToDate() {
        var cellOffset = cellToCellOffset.apply(null, arguments);
        var dayOffset = cellOffsetToDayOffset(cellOffset);
        var date = dayOffsetToDate(dayOffset);
        return date;
    }

    // cell -> cell offset
    // Possible arguments:
    // - row, col
    // - { row:#, col:# }
    function cellToCellOffset(row, col) {
        var colCnt = t.getColCnt();

        // rtl variables. wish we could pre-populate these. but where?
        var dis = isRTL ? -1 : 1;
        var dit = isRTL ? colCnt - 1 : 0;

        if (typeof row == 'object') {
            col = row.col;
            row = row.row;
        }
        var cellOffset = row * colCnt + (col * dis + dit); // column, adjusted for RTL (dis & dit)

        return cellOffset;
    }

    // cell offset -> day offset
    function cellOffsetToDayOffset(cellOffset) {
        var day0 = t.visStart.getDay(); // first date's day of week
        cellOffset += dayToCellMap[day0]; // normlize cellOffset to beginning-of-week
        return Math.floor(cellOffset / cellsPerWeek) * 7 // # of days from full weeks
            + cellToDayMap[ // # of days from partial last week
                (cellOffset % cellsPerWeek + cellsPerWeek) % cellsPerWeek // crazy math to handle negative cellOffsets
            ]
            - day0; // adjustment for beginning-of-week normalization
    }

    // day offset -> date (JavaScript Date object)
    function dayOffsetToDate(dayOffset) {
        var date = cloneDate(t.visStart);
        addDays(date, dayOffset);
        return date;
    }


    //
    // TRANSFORMATIONS: date -> day offset -> cell offset -> cell
    //

    // date -> cell (combines all transformations)
    function dateToCell(date) {
        var dayOffset = dateToDayOffset(date);
        var cellOffset = dayOffsetToCellOffset(dayOffset);
        var cell = cellOffsetToCell(cellOffset);
        return cell;
    }

    // date -> day offset
    function dateToDayOffset(date) {
        return dayDiff(date, t.visStart);
    }

    // day offset -> cell offset
    function dayOffsetToCellOffset(dayOffset) {
        var day0 = t.visStart.getDay(); // first date's day of week
        dayOffset += day0; // normalize dayOffset to beginning-of-week
        return Math.floor(dayOffset / 7) * cellsPerWeek // # of cells from full weeks
            + dayToCellMap[ // # of cells from partial last week
                (dayOffset % 7 + 7) % 7 // crazy math to handle negative dayOffsets
            ]
            - dayToCellMap[day0]; // adjustment for beginning-of-week normalization
    }

    // cell offset -> cell (object with row & col keys)
    function cellOffsetToCell(cellOffset) {
        var colCnt = t.getColCnt();

        // rtl variables. wish we could pre-populate these. but where?
        var dis = isRTL ? -1 : 1;
        var dit = isRTL ? colCnt - 1 : 0;

        var row = Math.floor(cellOffset / colCnt);
        var col = ((cellOffset % colCnt + colCnt) % colCnt) * dis + dit; // column, adjusted for RTL (dis & dit)
        return {
            row: row,
            col: col
        };
    }


    //
    // Converts a date range into an array of segment objects.
    // "Segments" are horizontal stretches of time, sliced up by row.
    // A segment object has the following properties:
    // - row
    // - cols
    // - isStart
    // - isEnd
    //
    function rangeToSegments(startDate, endDate) {
        var rowCnt = t.getRowCnt();
        var colCnt = t.getColCnt();
        var segments = []; // array of segments to return

        // day offset for given date range
        var rangeDayOffsetStart = dateToDayOffset(startDate);
        var rangeDayOffsetEnd = dateToDayOffset(endDate); // exclusive

        // first and last cell offset for the given date range
        // "last" implies inclusivity
        var rangeCellOffsetFirst = dayOffsetToCellOffset(rangeDayOffsetStart);
        var rangeCellOffsetLast = dayOffsetToCellOffset(rangeDayOffsetEnd) - 1;

        // loop through all the rows in the view
        for (var row=0; row<rowCnt; row++) {

            // first and last cell offset for the row
            var rowCellOffsetFirst = row * colCnt;
            var rowCellOffsetLast = rowCellOffsetFirst + colCnt - 1;

            // get the segment's cell offsets by constraining the range's cell offsets to the bounds of the row
            var segmentCellOffsetFirst = Math.max(rangeCellOffsetFirst, rowCellOffsetFirst);
            var segmentCellOffsetLast = Math.min(rangeCellOffsetLast, rowCellOffsetLast);

            // make sure segment's offsets are valid and in view
            if (segmentCellOffsetFirst <= segmentCellOffsetLast) {

                // translate to cells
                var segmentCellFirst = cellOffsetToCell(segmentCellOffsetFirst);
                var segmentCellLast = cellOffsetToCell(segmentCellOffsetLast);

                // view might be RTL, so order by leftmost column
                var cols = [ segmentCellFirst.col, segmentCellLast.col ].sort();

                // Determine if segment's first/last cell is the beginning/end of the date range.
                // We need to compare "day offset" because "cell offsets" are often ambiguous and
                // can translate to multiple days, and an edge case reveals itself when we the
                // range's first cell is hidden (we don't want isStart to be true).
                var isStart = cellOffsetToDayOffset(segmentCellOffsetFirst) == rangeDayOffsetStart;
                var isEnd = cellOffsetToDayOffset(segmentCellOffsetLast) + 1 == rangeDayOffsetEnd; // +1 for comparing exclusively

                segments.push({
                    row: row,
                    leftCol: cols[0],
                    rightCol: cols[1],
                    isStart: isStart,
                    isEnd: isEnd
                });
            }
        }

        return segments;
    }
    

}



function DayEventRenderer() {
    var t = this;

    
    // exports
    t.renderDayEvents = renderDayEvents;
    t.draggableDayEvent = draggableDayEvent; // made public so that subclasses can override
    t.resizableDayEvent = resizableDayEvent; // "
    
    
    // imports
    var opt = t.opt;
    var trigger = t.trigger;
    var isEventDraggable = t.isEventDraggable;
    var isEventResizable = t.isEventResizable;
    var eventEnd = t.eventEnd;
    var reportEventElement = t.reportEventElement;
    var eventElementHandlers = t.eventElementHandlers;
    var showEvents = t.showEvents;
    var hideEvents = t.hideEvents;
    var eventDrop = t.eventDrop;
    var eventResize = t.eventResize;
    var getRowCnt = t.getRowCnt;
    var getColCnt = t.getColCnt;
    var getColWidth = t.getColWidth;
    var allDayRow = t.allDayRow; // TODO: rename
    var colLeft = t.colLeft;
    var colRight = t.colRight;
    var colContentLeft = t.colContentLeft;
    var colContentRight = t.colContentRight;
    var dateToCell = t.dateToCell;
    var getDaySegmentContainer = t.getDaySegmentContainer;
    var formatDates = t.calendar.formatDates;
    var renderDayOverlay = t.renderDayOverlay;
    var clearOverlays = t.clearOverlays;
    var clearSelection = t.clearSelection;
    var getHoverListener = t.getHoverListener;
    var rangeToSegments = t.rangeToSegments;
    var cellToDate = t.cellToDate;
    var cellToCellOffset = t.cellToCellOffset;
    var cellOffsetToDayOffset = t.cellOffsetToDayOffset;
    var dateToDayOffset = t.dateToDayOffset;
    var dayOffsetToCellOffset = t.dayOffsetToCellOffset;


    // Render `events` onto the calendar, attach mouse event handlers, and call the `eventAfterRender` callback for each.
    // Mouse event will be lazily applied, except if the event has an ID of `modifiedEventId`.
    // Can only be called when the event container is empty (because it wipes out all innerHTML).
    function renderDayEvents(events, modifiedEventId) {

        // do the actual rendering. Receive the intermediate "segment" data structures.
        var segments = _renderDayEvents(
            events,
            false, // don't append event elements
            true // set the heights of the rows
        );

        // report the elements to the View, for general drag/resize utilities
        segmentElementEach(segments, function(segment, element) {
            reportEventElement(segment.event, element);
        });

        // attach mouse handlers
        attachHandlers(segments, modifiedEventId);

        // call `eventAfterRender` callback for each event
        segmentElementEach(segments, function(segment, element) {
            trigger('eventAfterRender', segment.event, segment.event, element);
        });
    }


    // Render an event on the calendar, but don't report them anywhere, and don't attach mouse handlers.
    // Append this event element to the event container, which might already be populated with events.
    // If an event's segment will have row equal to `adjustRow`, then explicitly set its top coordinate to `adjustTop`.
    // This hack is used to maintain continuity when user is manually resizing an event.
    // Returns an array of DOM elements for the event.
    function renderTempDayEvent(event, adjustRow, adjustTop) {

        // actually render the event. `true` for appending element to container.
        // Recieve the intermediate "segment" data structures.
        var segments = _renderDayEvents(
            [ event ],
            true, // append event elements
            false // don't set the heights of the rows
        );

        var elements = [];

        // Adjust certain elements' top coordinates
        segmentElementEach(segments, function(segment, element) {
            if (segment.row === adjustRow) {
                element.css('top', adjustTop);
            }
            elements.push(element[0]); // accumulate DOM nodes
        });

        return elements;
    }


    // Render events onto the calendar. Only responsible for the VISUAL aspect.
    // Not responsible for attaching handlers or calling callbacks.
    // Set `doAppend` to `true` for rendering elements without clearing the existing container.
    // Set `doRowHeights` to allow setting the height of each row, to compensate for vertical event overflow.
    function _renderDayEvents(events, doAppend, doRowHeights) {

        // where the DOM nodes will eventually end up
        var finalContainer = getDaySegmentContainer();

        // the container where the initial HTML will be rendered.
        // If `doAppend`==true, uses a temporary container.
        var renderContainer = doAppend ? $("<div/>") : finalContainer;

        var segments = buildSegments(events);
        var html;
        var elements;

        // calculate the desired `left` and `width` properties on each segment object
        calculateHorizontals(segments);

        // build the HTML string. relies on `left` property
        html = buildHTML(segments);

        // render the HTML. innerHTML is considerably faster than jQuery's .html()
        renderContainer[0].innerHTML = html;

        // retrieve the individual elements
        elements = renderContainer.children();

        // if we were appending, and thus using a temporary container,
        // re-attach elements to the real container.
        if (doAppend) {
            finalContainer.append(elements);
        }

        // assigns each element to `segment.event`, after filtering them through user callbacks
        resolveElements(segments, elements);

        // Calculate the left and right padding+margin for each element.
        // We need this for setting each element's desired outer width, because of the W3C box model.
        // It's important we do this in a separate pass from acually setting the width on the DOM elements
        // because alternating reading/writing dimensions causes reflow for every iteration.
        segmentElementEach(segments, function(segment, element) {
            segment.hsides = hsides(element, true); // include margins = `true`
        });

        // Set the width of each element
        segmentElementEach(segments, function(segment, element) {
            element.width(
                Math.max(0, segment.outerWidth - segment.hsides)
            );
        });

        // Grab each element's outerHeight (setVerticals uses this).
        // To get an accurate reading, it's important to have each element's width explicitly set already.
        segmentElementEach(segments, function(segment, element) {
            segment.outerHeight = element.outerHeight(true); // include margins = `true`
        });

        // Set the top coordinate on each element (requires segment.outerHeight)
        setVerticals(segments, doRowHeights);

        return segments;
    }


    // Generate an array of "segments" for all events.
    function buildSegments(events) {
        var segments = [];
        for (var i=0; i<events.length; i++) {
            var eventSegments = buildSegmentsForEvent(events[i]);
            segments.push.apply(segments, eventSegments); // append an array to an array
        }
        return segments;
    }


    // Generate an array of segments for a single event.
    // A "segment" is the same data structure that View.rangeToSegments produces,
    // with the addition of the `event` property being set to reference the original event.
    function buildSegmentsForEvent(event) {
        var startDate = event.start;
        var endDate = exclEndDay(event);
        var segments = rangeToSegments(startDate, endDate);
        for (var i=0; i<segments.length; i++) {
            segments[i].event = event;
        }
        return segments;
    }


    // Sets the `left` and `outerWidth` property of each segment.
    // These values are the desired dimensions for the eventual DOM elements.
    function calculateHorizontals(segments) {
        var isRTL = opt('isRTL');
        for (var i=0; i<segments.length; i++) {
            var segment = segments[i];

            // Determine functions used for calulating the elements left/right coordinates,
            // depending on whether the view is RTL or not.
            // NOTE:
            // colLeft/colRight returns the coordinate butting up the edge of the cell.
            // colContentLeft/colContentRight is indented a little bit from the edge.
            var leftFunc = (isRTL ? segment.isEnd : segment.isStart) ? colContentLeft : colLeft;
            var rightFunc = (isRTL ? segment.isStart : segment.isEnd) ? colContentRight : colRight;

            var left = leftFunc(segment.leftCol);
            var right = rightFunc(segment.rightCol);
            segment.left = left;
            segment.outerWidth = right - left;
        }
    }


    // Build a concatenated HTML string for an array of segments
    function buildHTML(segments) {
        var html = '';
        for (var i=0; i<segments.length; i++) {
            html += buildHTMLForSegment(segments[i]);
        }
        return html;
    }


    // Build an HTML string for a single segment.
    // Relies on the following properties:
    // - `segment.event` (from `buildSegmentsForEvent`)
    // - `segment.left` (from `calculateHorizontals`)
    function buildHTMLForSegment(segment) {
        var html = '';
        var isRTL = opt('isRTL');
        var event = segment.event;
        var url = event.url;

        // generate the list of CSS classNames
        var classNames = [ 'fc-event', 'fc-event-hori' ];
        if (isEventDraggable(event)) {
            classNames.push('fc-event-draggable');
        }
        if (segment.isStart) {
            classNames.push('fc-event-start');
        }
        if (segment.isEnd) {
            classNames.push('fc-event-end');
        }
        // use the event's configured classNames
        // guaranteed to be an array via `normalizeEvent`
        classNames = classNames.concat(event.className);
        if (event.source) {
            // use the event's source's classNames, if specified
            classNames = classNames.concat(event.source.className || []);
        }

        // generate a semicolon delimited CSS string for any of the "skin" properties
        // of the event object (`backgroundColor`, `borderColor` and such)
        var skinCss = getSkinCss(event, opt);

        if (url) {
            html += "<a href='" + htmlEscape(url) + "'";
        }else{
            html += "<div";
        }
        html +=
            " class='" + classNames.join(' ') + "'" +
            " style=" +
                "'" +
                "position:absolute;" +
                "left:" + segment.left + "px;" +
                skinCss +
                "'" +
            ">" +
            "<div class='fc-event-inner'>";
        if (!event.allDay && segment.isStart) {
            html +=
                "<span class='fc-event-time'>" +
                htmlEscape(
                    formatDates(event.start, event.end, opt('timeFormat'))
                ) +
                "</span>";
        }
        html +=
            "<span class='fc-event-title'>" +
            htmlEscape(event.title || '') +
            "</span>" +
            "</div>";
        if (segment.isEnd && isEventResizable(event)) {
            html +=
                "<div class='ui-resizable-handle ui-resizable-" + (isRTL ? 'w' : 'e') + "'>" +
                "&nbsp;&nbsp;&nbsp;" + // makes hit area a lot better for IE6/7
                "</div>";
        }
        html += "</" + (url ? "a" : "div") + ">";

        // TODO:
        // When these elements are initially rendered, they will be briefly visibile on the screen,
        // even though their widths/heights are not set.
        // SOLUTION: initially set them as visibility:hidden ?

        return html;
    }


    // Associate each segment (an object) with an element (a jQuery object),
    // by setting each `segment.element`.
    // Run each element through the `eventRender` filter, which allows developers to
    // modify an existing element, supply a new one, or cancel rendering.
    function resolveElements(segments, elements) {
        for (var i=0; i<segments.length; i++) {
            var segment = segments[i];
            var event = segment.event;
            var element = elements.eq(i);

            // call the trigger with the original element
            var triggerRes = trigger('eventRender', event, event, element);

            if (triggerRes === false) {
                // if `false`, remove the event from the DOM and don't assign it to `segment.event`
                element.remove();
            }
            else {
                if (triggerRes && triggerRes !== true) {
                    // the trigger returned a new element, but not `true` (which means keep the existing element)

                    // re-assign the important CSS dimension properties that were already assigned in `buildHTMLForSegment`
                    triggerRes = $(triggerRes)
                        .css({
                            position: 'absolute',
                            left: segment.left
                        });

                    element.replaceWith(triggerRes);
                    element = triggerRes;
                }

                segment.element = element;
            }
        }
    }



    /* Top-coordinate Methods
    -------------------------------------------------------------------------------------------------*/


    // Sets the "top" CSS property for each element.
    // If `doRowHeights` is `true`, also sets each row's first cell to an explicit height,
    // so that if elements vertically overflow, the cell expands vertically to compensate.
    function setVerticals(segments, doRowHeights) {
        var rowContentHeights = calculateVerticals(segments); // also sets segment.top
        var rowContentElements = getRowContentElements(); // returns 1 inner div per row
        var rowContentTops = [];

        // Set each row's height by setting height of first inner div
        if (doRowHeights) {
            for (var i=0; i<rowContentElements.length; i++) {
                rowContentElements[i].height(rowContentHeights[i]);
            }
        }

        // Get each row's top, relative to the views's origin.
        // Important to do this after setting each row's height.
        for (var i=0; i<rowContentElements.length; i++) {
            rowContentTops.push(
                rowContentElements[i].position().top
            );
        }

        // Set each segment element's CSS "top" property.
        // Each segment object has a "top" property, which is relative to the row's top, but...
        segmentElementEach(segments, function(segment, element) {
            element.css(
                'top',
                rowContentTops[segment.row] + segment.top // ...now, relative to views's origin
            );
        });
    }


    // Calculate the "top" coordinate for each segment, relative to the "top" of the row.
    // Also, return an array that contains the "content" height for each row
    // (the height displaced by the vertically stacked events in the row).
    // Requires segments to have their `outerHeight` property already set.
    function calculateVerticals(segments) {
        var rowCnt = getRowCnt();
        var colCnt = getColCnt();
        var rowContentHeights = []; // content height for each row
        var segmentRows = buildSegmentRows(segments); // an array of segment arrays, one for each row

        for (var rowI=0; rowI<rowCnt; rowI++) {
            var segmentRow = segmentRows[rowI];

            // an array of running total heights for each column.
            // initialize with all zeros.
            var colHeights = [];
            for (var colI=0; colI<colCnt; colI++) {
                colHeights.push(0);
            }

            // loop through every segment
            for (var segmentI=0; segmentI<segmentRow.length; segmentI++) {
                var segment = segmentRow[segmentI];

                // find the segment's top coordinate by looking at the max height
                // of all the columns the segment will be in.
                segment.top = arrayMax(
                    colHeights.slice(
                        segment.leftCol,
                        segment.rightCol + 1 // make exclusive for slice
                    )
                );

                // adjust the columns to account for the segment's height
                for (var colI=segment.leftCol; colI<=segment.rightCol; colI++) {
                    colHeights[colI] = segment.top + segment.outerHeight;
                }
            }

            // the tallest column in the row should be the "content height"
            rowContentHeights.push(arrayMax(colHeights));
        }

        return rowContentHeights;
    }


    // Build an array of segment arrays, each representing the segments that will
    // be in a row of the grid, sorted by which event should be closest to the top.
    function buildSegmentRows(segments) {
        var rowCnt = getRowCnt();
        var segmentRows = [];
        var segmentI;
        var segment;
        var rowI;

        // group segments by row
        for (segmentI=0; segmentI<segments.length; segmentI++) {
            segment = segments[segmentI];
            rowI = segment.row;
            if (segment.element) { // was rendered?
                if (segmentRows[rowI]) {
                    // already other segments. append to array
                    segmentRows[rowI].push(segment);
                }
                else {
                    // first segment in row. create new array
                    segmentRows[rowI] = [ segment ];
                }
            }
        }

        // sort each row
        for (rowI=0; rowI<rowCnt; rowI++) {
            segmentRows[rowI] = sortSegmentRow(
                segmentRows[rowI] || [] // guarantee an array, even if no segments
            );
        }

        return segmentRows;
    }


    // Sort an array of segments according to which segment should appear closest to the top
    function sortSegmentRow(segments) {
        var sortedSegments = [];

        // build the subrow array
        var subrows = buildSegmentSubrows(segments);

        // flatten it
        for (var i=0; i<subrows.length; i++) {
            sortedSegments.push.apply(sortedSegments, subrows[i]); // append an array to an array
        }

        return sortedSegments;
    }


    // Take an array of segments, which are all assumed to be in the same row,
    // and sort into subrows.
    function buildSegmentSubrows(segments) {

        // Give preference to elements with certain criteria, so they have
        // a chance to be closer to the top.
        segments.sort(compareDaySegments);

        var subrows = [];
        for (var i=0; i<segments.length; i++) {
            var segment = segments[i];

            // loop through subrows, starting with the topmost, until the segment
            // doesn't collide with other segments.
            for (var j=0; j<subrows.length; j++) {
                if (!isDaySegmentCollision(segment, subrows[j])) {
                    break;
                }
            }
            // `j` now holds the desired subrow index
            if (subrows[j]) {
                subrows[j].push(segment);
            }
            else {
                subrows[j] = [ segment ];
            }
        }

        return subrows;
    }


    // Return an array of jQuery objects for the placeholder content containers of each row.
    // The content containers don't actually contain anything, but their dimensions should match
    // the events that are overlaid on top.
    function getRowContentElements() {
        var i;
        var rowCnt = getRowCnt();
        var rowDivs = [];
        for (i=0; i<rowCnt; i++) {
            rowDivs[i] = allDayRow(i)
                .find('div.fc-day-content > div');
        }
        return rowDivs;
    }



    /* Mouse Handlers
    ---------------------------------------------------------------------------------------------------*/
    // TODO: better documentation!


    function attachHandlers(segments, modifiedEventId) {
        var segmentContainer = getDaySegmentContainer();

        segmentElementEach(segments, function(segment, element, i) {
            var event = segment.event;
            if (event._id === modifiedEventId) {
                bindDaySeg(event, element, segment);
            }else{
                element[0]._fci = i; // for lazySegBind
            }
        });

        lazySegBind(segmentContainer, segments, bindDaySeg);
    }


    function bindDaySeg(event, eventElement, segment) {

        if (isEventDraggable(event)) {
            t.draggableDayEvent(event, eventElement, segment); // use `t` so subclasses can override
        }

        if (
            segment.isEnd && // only allow resizing on the final segment for an event
            isEventResizable(event)
        ) {
            t.resizableDayEvent(event, eventElement, segment); // use `t` so subclasses can override
        }

        // attach all other handlers.
        // needs to be after, because resizableDayEvent might stopImmediatePropagation on click
        eventElementHandlers(event, eventElement);
    }

    
    function draggableDayEvent(event, eventElement) {
        var hoverListener = getHoverListener();
        var dayDelta;
        eventElement.draggable({
            delay: 50,
            opacity: opt('dragOpacity'),
            revertDuration: opt('dragRevertDuration'),
            start: function(ev, ui) {
                trigger('eventDragStart', eventElement, event, ev, ui);
                hideEvents(event, eventElement);
                hoverListener.start(function(cell, origCell, rowDelta, colDelta) {
                    eventElement.draggable('option', 'revert', !cell || !rowDelta && !colDelta);
                    clearOverlays();
                    if (cell) {
                        var origDate = cellToDate(origCell);
                        var date = cellToDate(cell);
                        dayDelta = dayDiff(date, origDate);
                        renderDayOverlay(
                            addDays(cloneDate(event.start), dayDelta),
                            addDays(exclEndDay(event), dayDelta)
                        );
                    }else{
                        dayDelta = 0;
                    }
                }, ev, 'drag');
            },
            stop: function(ev, ui) {
                hoverListener.stop();
                clearOverlays();
                trigger('eventDragStop', eventElement, event, ev, ui);
                if (dayDelta) {
                    eventDrop(this, event, dayDelta, 0, event.allDay, ev, ui);
                }else{
                    eventElement.css('filter', ''); // clear IE opacity side-effects
                    showEvents(event, eventElement);
                }
            }
        });
    }

    
    function resizableDayEvent(event, element, segment) {
        var isRTL = opt('isRTL');
        var direction = isRTL ? 'w' : 'e';
        var handle = element.find('.ui-resizable-' + direction); // TODO: stop using this class because we aren't using jqui for this
        var isResizing = false;
        
        // TODO: look into using jquery-ui mouse widget for this stuff
        disableTextSelection(element); // prevent native <a> selection for IE
        element
            .mousedown(function(ev) { // prevent native <a> selection for others
                ev.preventDefault();
            })
            .click(function(ev) {
                if (isResizing) {
                    ev.preventDefault(); // prevent link from being visited (only method that worked in IE6)
                    ev.stopImmediatePropagation(); // prevent fullcalendar eventClick handler from being called
                                                   // (eventElementHandlers needs to be bound after resizableDayEvent)
                }
            });
        
        handle.mousedown(function(ev) {
            if (ev.which != 1) {
                return; // needs to be left mouse button
            }
            isResizing = true;
            var hoverListener = getHoverListener();
            var rowCnt = getRowCnt();
            var colCnt = getColCnt();
            var elementTop = element.css('top');
            var dayDelta;
            var helpers;
            var eventCopy = $.extend({}, event);
            var minCellOffset = dayOffsetToCellOffset( dateToDayOffset(event.start) );
            clearSelection();
            $('body')
                .css('cursor', direction + '-resize')
                .one('mouseup', mouseup);
            trigger('eventResizeStart', this, event, ev);
            hoverListener.start(function(cell, origCell) {
                if (cell) {

                    var origCellOffset = cellToCellOffset(origCell);
                    var cellOffset = cellToCellOffset(cell);

                    // don't let resizing move earlier than start date cell
                    cellOffset = Math.max(cellOffset, minCellOffset);

                    dayDelta =
                        cellOffsetToDayOffset(cellOffset) -
                        cellOffsetToDayOffset(origCellOffset);

                    if (dayDelta) {
                        eventCopy.end = addDays(eventEnd(event), dayDelta, true);
                        var oldHelpers = helpers;

                        helpers = renderTempDayEvent(eventCopy, segment.row, elementTop);
                        helpers = $(helpers); // turn array into a jQuery object

                        helpers.find('*').css('cursor', direction + '-resize');
                        if (oldHelpers) {
                            oldHelpers.remove();
                        }

                        hideEvents(event);
                    }
                    else {
                        if (helpers) {
                            showEvents(event);
                            helpers.remove();
                            helpers = null;
                        }
                    }
                    clearOverlays();
                    renderDayOverlay( // coordinate grid already rebuilt with hoverListener.start()
                        event.start,
                        addDays( exclEndDay(event), dayDelta )
                        // TODO: instead of calling renderDayOverlay() with dates,
                        // call _renderDayOverlay (or whatever) with cell offsets.
                    );
                }
            }, ev);
            
            function mouseup(ev) {
                trigger('eventResizeStop', this, event, ev);
                $('body').css('cursor', '');
                hoverListener.stop();
                clearOverlays();
                if (dayDelta) {
                    eventResize(this, event, dayDelta, 0, ev);
                    // event redraw will clear helpers
                }
                // otherwise, the drag handler already restored the old events
                
                setTimeout(function() { // make this happen after the element's click event
                    isResizing = false;
                },0);
            }
        });
    }
    

}



/* Generalized Segment Utilities
-------------------------------------------------------------------------------------------------*/


function isDaySegmentCollision(segment, otherSegments) {
    for (var i=0; i<otherSegments.length; i++) {
        var otherSegment = otherSegments[i];
        if (
            otherSegment.leftCol <= segment.rightCol &&
            otherSegment.rightCol >= segment.leftCol
        ) {
            return true;
        }
    }
    return false;
}


function segmentElementEach(segments, callback) { // TODO: use in AgendaView?
    for (var i=0; i<segments.length; i++) {
        var segment = segments[i];
        var element = segment.element;
        if (element) {
            callback(segment, element, i);
        }
    }
}


// A cmp function for determining which segments should appear higher up
function compareDaySegments(a, b) {
    return (b.rightCol - b.leftCol) - (a.rightCol - a.leftCol) || // put wider events first
        b.event.allDay - a.event.allDay || // if tie, put all-day events first (booleans cast to 0/1)
        a.event.start - b.event.start || // if a tie, sort by event start date
        (a.event.title || '').localeCompare(b.event.title); // if a tie, sort by event title
}




//BUG: unselect needs to be triggered when events are dragged+dropped

function SelectionManager() {
    var t = this;
    
    
    // exports
    t.select = select;
    t.unselect = unselect;
    t.reportSelection = reportSelection;
    t.daySelectionMousedown = daySelectionMousedown;
    
    
    // imports
    var opt = t.opt;
    var trigger = t.trigger;
    var defaultSelectionEnd = t.defaultSelectionEnd;
    var renderSelection = t.renderSelection;
    var clearSelection = t.clearSelection;
    
    
    // locals
    var selected = false;



    // unselectAuto
    if (opt('selectable') && opt('unselectAuto')) {
        $(document).mousedown(function(ev) {
            var ignore = opt('unselectCancel');
            if (ignore) {
                if ($(ev.target).parents(ignore).length) { // could be optimized to stop after first match
                    return;
                }
            }
            unselect(ev);
        });
    }
    

    function select(startDate, endDate, allDay) {
        unselect();
        if (!endDate) {
            endDate = defaultSelectionEnd(startDate, allDay);
        }
        renderSelection(startDate, endDate, allDay);
        reportSelection(startDate, endDate, allDay);
    }
    
    
    function unselect(ev) {
        if (selected) {
            selected = false;
            clearSelection();
            trigger('unselect', null, ev);
        }
    }
    
    
    function reportSelection(startDate, endDate, allDay, ev) {
        selected = true;
        trigger('select', null, startDate, endDate, allDay, ev);
    }
    
    
    function daySelectionMousedown(ev) { // not really a generic manager method, oh well
        var cellToDate = t.cellToDate;
        var getIsCellAllDay = t.getIsCellAllDay;
        var hoverListener = t.getHoverListener();
        var reportDayClick = t.reportDayClick; // this is hacky and sort of weird
        if (ev.which == 1 && opt('selectable')) { // which==1 means left mouse button
            unselect(ev);
            var _mousedownElement = this;
            var dates;
            hoverListener.start(function(cell, origCell) { // TODO: maybe put cellToDate/getIsCellAllDay info in cell
                clearSelection();
                if (cell && getIsCellAllDay(cell)) {
                    dates = [ cellToDate(origCell), cellToDate(cell) ].sort(dateCompare);
                    renderSelection(dates[0], dates[1], true);
                }else{
                    dates = null;
                }
            }, ev);
            $(document).one('mouseup', function(ev) {
                hoverListener.stop();
                if (dates) {
                    if (+dates[0] == +dates[1]) {
                        reportDayClick(dates[0], true, ev);
                    }
                    reportSelection(dates[0], dates[1], true, ev);
                }
            });
        }
    }


}


 
function OverlayManager() {
    var t = this;
    
    
    // exports
    t.renderOverlay = renderOverlay;
    t.clearOverlays = clearOverlays;
    
    
    // locals
    var usedOverlays = [];
    var unusedOverlays = [];
    
    
    function renderOverlay(rect, parent) {
        var e = unusedOverlays.shift();
        if (!e) {
            e = $("<div class='fc-cell-overlay' style='position:absolute;z-index:3'/>");
        }
        if (e[0].parentNode != parent[0]) {
            e.appendTo(parent);
        }
        usedOverlays.push(e.css(rect).show());
        return e;
    }
    

    function clearOverlays() {
        var e;
        while (e = usedOverlays.shift()) {
            unusedOverlays.push(e.hide().unbind());
        }
    }


}



function CoordinateGrid(buildFunc) {

    var t = this;
    var rows;
    var cols;
    
    
    t.build = function() {
        rows = [];
        cols = [];
        buildFunc(rows, cols);
    };
    
    
    t.cell = function(x, y) {
        var rowCnt = rows.length;
        var colCnt = cols.length;
        var i, r=-1, c=-1;
        for (i=0; i<rowCnt; i++) {
            if (y >= rows[i][0] && y < rows[i][1]) {
                r = i;
                break;
            }
        }
        for (i=0; i<colCnt; i++) {
            if (x >= cols[i][0] && x < cols[i][1]) {
                c = i;
                break;
            }
        }
        return (r>=0 && c>=0) ? { row:r, col:c } : null;
    };
    
    
    t.rect = function(row0, col0, row1, col1, originElement) { // row1,col1 is inclusive
        var origin = originElement.offset();
        return {
            top: rows[row0][0] - origin.top,
            left: cols[col0][0] - origin.left,
            width: cols[col1][1] - cols[col0][0],
            height: rows[row1][1] - rows[row0][0]
        };
    };

}



function HoverListener(coordinateGrid) {


    var t = this;
    var bindType;
    var change;
    var firstCell;
    var cell;
    
    
    t.start = function(_change, ev, _bindType) {
        change = _change;
        firstCell = cell = null;
        coordinateGrid.build();
        mouse(ev);
        bindType = _bindType || 'mousemove';
        $(document).bind(bindType, mouse);
    };
    
    
    function mouse(ev) {
        _fixUIEvent(ev); // see below
        var newCell = coordinateGrid.cell(ev.pageX, ev.pageY);
        if (!newCell != !cell || newCell && (newCell.row != cell.row || newCell.col != cell.col)) {
            if (newCell) {
                if (!firstCell) {
                    firstCell = newCell;
                }
                change(newCell, firstCell, newCell.row-firstCell.row, newCell.col-firstCell.col);
            }else{
                change(newCell, firstCell);
            }
            cell = newCell;
        }
    }
    
    
    t.stop = function() {
        $(document).unbind(bindType, mouse);
        return cell;
    };
    
    
}



// this fix was only necessary for jQuery UI 1.8.16 (and jQuery 1.7 or 1.7.1)
// upgrading to jQuery UI 1.8.17 (and using either jQuery 1.7 or 1.7.1) fixed the problem
// but keep this in here for 1.8.16 users
// and maybe remove it down the line

function _fixUIEvent(event) { // for issue 1168
    if (event.pageX === undefined) {
        event.pageX = event.originalEvent.pageX;
        event.pageY = event.originalEvent.pageY;
    }
}


function HorizontalPositionCache(getElement) {

    var t = this,
        elements = {},
        lefts = {},
        rights = {};
        
    function e(i) {
        return elements[i] = elements[i] || getElement(i);
    }
    
    t.left = function(i) {
        return lefts[i] = lefts[i] === undefined ? e(i).position().left : lefts[i];
    };
    
    t.right = function(i) {
        return rights[i] = rights[i] === undefined ? t.left(i) + e(i).width() : rights[i];
    };
    
    t.clear = function() {
        elements = {};
        lefts = {};
        rights = {};
    };
    
}



})(jQuery);
